[shp cleanup 01..20] all the rest (re: 2d3ec8b6)

This combines 20 cleanup commits from the dev branch.

All changed files:
- Clean up pointer defererences to sh.
- Remove shp arguments from functions.

Other notable changes:

src/cmd/ksh93/include/shell.h,
src/cmd/ksh93/sh/init.c:
- On second thought, get rid of the function version of
  sh_getinterp() as libshell ABI compatibility is moot. We've
  already been breaking that by reordering the sh struct, so there
  is no way it's going to work without recompiling.

src/cmd/ksh93/sh/name.c:
- De-obfuscate the relationship between nv_scan() and scanfilter().
  The former just calls the latter as a static function, there's no
  need to do that via a function pointer and void* type conversions.

src/cmd/ksh93/bltins/typeset.c,
src/cmd/ksh93/sh/name.c,
src/cmd/ksh93/sh/nvdisc.c:
- 'struct adata' and 'struct tdata', defined as local struct types
  in these files, need to have their first three fields in common,
  the first being a pointer to sh. This is because scanfilter() in
  name.c accesses these fields via a type conversion. So the sh
  field needed to be removed in all three at the same time.
  TODO: de-obfuscate: good practice definition via a header file.

src/cmd/ksh93/sh/path.c:
- Naming consistency: reserve the path_ function name prefix for
  externs and rename statics with that prefix.
- The default path was sometimes referred to as the standard path.
  To use one term, rename std_path to defpath and onstdpath() to
  ondefpath().
- De-obfuscate SHOPT_PFSH conditional code by only calling
  pf_execve() (was path_pfexecve()) if that is compiled in.

src/cmd/ksh93/include/streval.h,
src/cmd/ksh93/sh/streval.c:
- Rename extern strval() to arith_strval() for consistency.

src/cmd/ksh93/sh/string.c:
- Remove outdated/incorrect isxdigit() fallback; '#ifnded isxdigit'
  is not a correct test as isxdigit() is specified as a function.
  Plus, it's part of C89/C90 which we now require. (re: ac8991e5)

src/cmd/ksh93/sh/suid_exec.c:
- Replace an incorrect reference to shgd->current_pid with
  getpid(); it cannot work as (contrary to its misleading directory
  placement) suid_exec is an independent libast program with no
  link to ksh or libshell at all. However, no one noticed because
  this was in fallback code for ancient systems without
  setreuid(2). Since that standard function was specified in POSIX
  Issue 4 Version 2 from 1994, we should remove that fallback code
  sometime as part of another obsolete code cleanup operation to
  avoid further bit rot. (re: 843b546c)

src/cmd/ksh93/bltins/print.c: genformat():
- Remove preformat[] which was always empty and had no effect.

src/cmd/ksh93/shell.3:
- Minor copy-edit.
- Remove documentation for nonexistent sh.infile_name. A search
  through ast-open-archive[*] reveals this never existed at all.
- Document sh.savexit (== $?).

src/cmd/ksh93/shell.3,
src/cmd/ksh93/include/shell.h,
src/cmd/ksh93/sh/init.c:
- Remove sh.gd/shgd; this is now unused and was never documented
  or exposed in the shell.h public interface.
- sh_sigcheck() was documented in shell.3 as taking no arguments
  whereas in the actual code it took a shp argument. I decided to
  go with the documentation.
- That leaves sh_parse() as the only documented function that still
  takes an shp argument. I'm just going to go ahead and remove it
  for consistency, reverting sh_parse() to its pre-2003 spec.
- Remove undocumented/unused sh_bltin_tree() function which simply
  returned sh.bltin_tree.
- Bump SH_VERSION to 20220106.

src/cmd/ksh93/include/path.h

@@ -63,7 +63,6 @@ typedef struct pathcomp
 	char		*blib;
 	unsigned short	len;
 	unsigned short	flags;
-	Shell_t		*shp;
 } Pathcomp_t;
 
 #ifndef ARG_RAW
@@ -71,38 +70,42 @@ typedef struct pathcomp
 #endif /* !ARG_RAW */
 
 /* pathname handling routines */
-extern void		path_newdir(Shell_t*,Pathcomp_t*);
+extern void		path_newdir(Pathcomp_t*);
 extern Pathcomp_t	*path_dirfind(Pathcomp_t*,const char*,int);
-extern Pathcomp_t	*path_unsetfpath(Shell_t*);
-extern Pathcomp_t	*path_addpath(Shell_t*,Pathcomp_t*,const char*,int);
+extern Pathcomp_t	*path_unsetfpath(void);
+extern Pathcomp_t	*path_addpath(Pathcomp_t*,const char*,int);
 extern Pathcomp_t	*path_dup(Pathcomp_t*);
 extern void		path_delete(Pathcomp_t*);
 extern void 		path_alias(Namval_t*,Pathcomp_t*);
-extern Pathcomp_t 	*path_absolute(Shell_t*, const char*, Pathcomp_t*, int);
+extern Pathcomp_t 	*path_absolute(const char*, Pathcomp_t*, int);
 extern char 		*path_basename(const char*);
-extern char 		*path_fullname(Shell_t*,const char*);
-extern int 		path_expand(Shell_t*,const char*, struct argnod**);
-extern noreturn void 	path_exec(Shell_t*,const char*,char*[],struct argnod*);
-extern pid_t		path_spawn(Shell_t*,const char*,char*[],char*[],Pathcomp_t*,int);
+extern char 		*path_fullname(const char*);
+extern int 		path_expand(const char*, struct argnod**);
+extern noreturn void 	path_exec(const char*,char*[],struct argnod*);
+extern pid_t		path_spawn(const char*,char*[],char*[],Pathcomp_t*,int);
 #if defined(__EXPORT__) && defined(_BLD_DLL)
 #   define extern __EXPORT__
 #endif
-extern int		path_open(Shell_t*,const char*,Pathcomp_t*);
-extern Pathcomp_t 	*path_get(Shell_t*,const char*);
+extern int		path_open(const char*,Pathcomp_t*);
+extern Pathcomp_t 	*path_get(const char*);
 #undef extern
-extern char 		*path_pwd(Shell_t*,int);
-extern Pathcomp_t	*path_nextcomp(Shell_t*,Pathcomp_t*,const char*,Pathcomp_t*);
-extern int		path_search(Shell_t*,const char*,Pathcomp_t**,int);
-extern char		*path_relative(Shell_t*,const char*);
-extern int		path_complete(Shell_t*,const char*, const char*,struct argnod**);
+extern char 		*path_pwd(void);
+extern Pathcomp_t	*path_nextcomp(Pathcomp_t*,const char*,Pathcomp_t*);
+extern int		path_search(const char*,Pathcomp_t**,int);
+extern char		*path_relative(const char*);
+extern int		path_complete(const char*, const char*,struct argnod**);
 #if SHOPT_BRACEPAT
-    extern int 		path_generate(Shell_t*,struct argnod*,struct argnod**);
+    extern int 		path_generate(struct argnod*,struct argnod**);
 #endif /* SHOPT_BRACEPAT */
-    extern int		path_xattr(Shell_t*, const char*, char*);
+#if SHOPT_PFSH
+    extern int		path_xattr(const char*, char*);
+#endif /* SHOPT_PFSH */
 
+#if SHOPT_DYNAMIC
 /* builtin/plugin routines */
-extern int		sh_addlib(Shell_t*,void*,char*,Pathcomp_t*);
-extern Shbltin_f	sh_getlib(Shell_t*,char*,Pathcomp_t*);
+extern int		sh_addlib(void*,char*,Pathcomp_t*);
+extern Shbltin_f	sh_getlib(char*,Pathcomp_t*);
+#endif /* SHOPT_DYNAMIC */
 
 /* constant strings needed for whence */
 extern const char e_timeformat[];