Re-fix defining types conditionally or in subshells (re: f508660d)

New version. I'm pretty sure the problems that forced me to revert
it earlier are fixed.

This commit mitigates the effects of the hack explained in the
referenced commit so that dummy built-in command nodes added by the
parser for declaration/assignment purposes do not leak out into the
execution level, except in a relatively harmless corner case.

Something like

    if false; then
        typeset -T Foo_t=(integer -i bar)
    fi

will no longer leave a broken dummy Foo_t declaration command. The
same applies to declaration commands created with enum.

The corner case remaining is:

    $ ksh -c 'false && enum E_t=(a b c); E_t -a x=(b b a c)'
    ksh: E_t: not found

Since the 'enum' command is not executed, this should have thrown
a syntax error on the 'E_t -a' declaration:
ksh: syntax error at line 1: `(' unexpected

This is because the -c script is parsed entirely before being
executed, so E_t is recognised as a declaration built-in at parse
time. However, the 'not found' error shows that it was successfully
eliminated at execution time, so the inconsistent state will no
longer persist.

This fix now allows another fix to be effective as well: since
built-ins do not know about virtual subshells, fork a virtual
subshell into a real subshell before adding any built-ins.

src/cmd/ksh93/sh/parse.c:

- Add a pair of functions, dcl_hactivate() and dcl_dehacktivate(),
  that (de)activate an internal declaration built-ins tree into
  which check_typedef() can pre-add dummy type declaration command
  nodes. A viewpath from the main built-ins tree to this internal
  tree is added, unifying the two for search purposes and causing
  new nodes to be added to the internal tree. When parsing is done,
  we close that viewpath. This hides those pre-added nodes at
  execution time. Since the parser is sometimes called recursively
  (e.g. for command substitutions), keep track of this and only
  activate and deactivate at the first level.
     (Fixed compared to previous version of this commit: calling
  dcl_dehacktivate() when the recursion level is already zero is
  now a harmless no-op. Since this only occurs in error handling
  conditions, who cares.)

- We also need to catch errors. This is done by setting libast's
  error_info.exit variable to a dcl_exit() function that tidies up
  and then passes control to the original (usually sh_exit()).
     (Fixed compared to previous version of this commit: dcl_exit()
  immediately deactivates the hack, no matter the recursion level,
  and restores the regular sh_exit(). This is the right thing to
  do when we're in the process of erroring out.)

- sh_cmd(): This is the most central function in the parser. You'd
  think it was sh_parse(), but $(modern)-form command substitutions
  use sh_dolparen() instead. Both call sh_cmd(). So let's simply
  add a dcl_hacktivate() call at the beginning and a
  dcl_deactivate() call at the end.

- assign(): This function calls path_search(), which among many
  other things executes an FPATH search, which may execute
  arbitrary code at parse time (!!!). So, regardless of recursion
  level, forcibly dehacktivate() to avoid those ugly parser side
  effects returning in that context.

src/cmd/ksh93/bltins/enum.c: b_enum():

- Fork a virtual subshell before adding a built-in.

src/cmd/ksh93/sh/xec.c: sh_exec():

- Fork a virtual subshell when detecting typeset's -T option.

Improves fix to https://github.com/ksh93/ksh/issues/256

src/cmd/ksh93/bltins/enum.c

@@ -21,7 +21,7 @@
 #pragma prototyped
 #include	"defs.h"
 
-#define ENUM_ID "enum (ksh 93u+m) 2021-11-23"
+#define ENUM_ID "enum (ksh 93u+m) 2021-12-17"
 
 const char sh_optenum[] =
 "[-?@(#)$Id: " ENUM_ID " $\n]"
@@ -239,6 +239,10 @@ int b_enum(int argc, char** argv, Shbltin_t *context)
 		error(ERROR_USAGE|2, "%s", optusage(NiL));
 		return 1;
 	}
+#ifndef STANDALONE
+	if(sh.subshell && !sh.subshare)
+		sh_subfork();
+#endif
 	while(cp = *argv++)
 	{
 		if(!(np = nv_open(cp, (void*)0, NV_VARNAME|NV_NOADD))  || !(ap=nv_arrayptr(np)) || ap->fun || (sz=ap->nelem&(((1L<<ARRAY_BITS)-1))) < 2)