Build fix for Linux i386

iffe feature test that add a -D_LARGEFILE64_SOURCE compiler flag to
detect the presence of 64-bit types like off64_t are very
incorrect; they always find the type even if the rest of the source
is not compiled with that flag, causing an inconsistent compilation
environment. This was the cause of mysterious failures to compile
some feature tests on Linux i386 -- it tried to use an off64_t type
that was wrongly detected.

A flag like -D_LARGEFILE64_SOURCE needs to be added to the compiler
flags consistently so it is used for compiling all files and tests.

src/lib/libast/features/dirent,
src/lib/libast/features/fs,
src/lib/libast/features/lib,
src/lib/libast/features/mmap,
src/cmd/ksh93/features/rlimits:
- Remove the -D_LARGEFILE64_SOURCE flag from all the tests that
  used it.
- Fix some preprocessor directives for compiling without
  _LARGEFILE64_SOURCE. We cannot rely on the result of the _lib_*64
  tests because those functions are still found in glibc even if
  _LARGEFILE64_SOURCE is not defined; we have to check for the
  existence of the type definitions before using them.

src/cmd/INIT/cc.linux.i386,
src/cmd/INIT/cc.linux.i386-icc:
- Add/update compiler wrappers to hardcode -D_LARGEFILE64_SOURCE
  in the flags for the default compiler. If it is overriden with
  $CC, then it needs to be added manually if desired.

src/cmd/INIT/cc.linux.i386

@@ -0,0 +1,9 @@
+: linux.i386 cc wrapper : 2021-01-31 :
+
+HOSTTYPE=linux.i386
+
+case " $* " in
+*" -dumpmachine "*) echo $HOSTTYPE; exit ;;
+esac
+
+exec /usr/bin/cc -P -D_LARGEFILE64_SOURCE "$@"

src/cmd/INIT/cc.linux.i386-icc

@@ -1,4 +1,4 @@
-: linux.ia64 icc wrapper : 2011-10-18 :
+: linux.ia64 icc wrapper : 2021-01-31 :
 
 HOSTTYPE=linux.ia64-icc
 
@@ -19,4 +19,4 @@ case $icc in
 	esac
 	;;
 esac
-$icc "$@"
+exec "$icc" -D_LARGEFILE64_SOURCE "$@"

src/cmd/ksh93/features/rlimits

@@ -6,17 +6,15 @@ cat{
 
 #if _sys_resource
 #	include <sys/resource.h>
-#	if _lib_getrlimit64
+#	if _lib_getrlimit64 && _typ_rlim64_t
 #		undef	getrlimit
 #		define	getrlimit	getrlimit64
 #		undef	setrlimit
 #		define	setrlimit	setrlimit64
-#		if _typ_rlim64_t
 #		undef	rlimit
 #		define	rlimit	rlimit64
 #		undef	rlim_t
 #		define	rlim_t	rlim64_t
-#		endif
 #		ifdef RLIM64_INFINITY
 #			undef	RLIM_INFINITY
 #			define	RLIM_INFINITY	RLIM64_INFINITY

src/lib/libast/features/dirent

@@ -1,8 +1,8 @@
 set	prototyped
 
 set	nodefine
-lib	stat64 -D_LARGEFILE64_SOURCE
+lib	stat64
-typ	off64_t -D_LARGEFILE64_SOURCE
+typ	off64_t
 set	define
 
 lib	opendir
@@ -10,7 +10,7 @@ hdr	dirent,ndir
 sys	dir
 nxt	dirent
 
-tst	botch_d_ino_dirent64 -D_LARGEFILE64_SOURCE note{ dirent64.d_ino vs. readdir64 mismatch }end compile{
+tst	botch_d_ino_dirent64 note{ dirent64.d_ino vs. readdir64 mismatch }end compile{
 	#if !__arm__
 	)
 	#endif

src/lib/libast/features/fs

@@ -1,9 +1,9 @@
 set	prototyped
 lib	_fxstat,__fxstat,_lxstat,__lxstat,_xmknod,__xmknod,_xstat,__xstat,lstat,mknod,sync sys/types.h sys/stat.h
-lib	_fxstat64,__fxstat64,_lxstat64,__lxstat64,_xstat64,__xstat64 -D_LARGEFILE64_SOURCE sys/types.h sys/stat.h
+lib	_fxstat64,__fxstat64,_lxstat64,__lxstat64,_xstat64,__xstat64 sys/types.h sys/stat.h
 mac	fstat,lstat,stat,mknod sys/types.h sys/stat.h
 
-lcl	xstat -D_LARGEFILE64_SOURCE link{
+lcl	xstat link{
 	#include <sys/types.h>
 	#include <sys/stat.h>
 	struct stat64 { int xxx; }; /* disable if stat64 available */
@@ -29,7 +29,7 @@ lcl	xstat -D_LARGEFILE64_SOURCE link{
 	}
 }end
 
-lcl	xstat64 -D_LARGEFILE64_SOURCE link{
+lcl	xstat64 link{
 	#include <sys/types.h>
 	#include <sys/stat.h>
 	#if _STD_
@@ -211,7 +211,6 @@ cat{
 	#if _typ_off64_t
 	#undef	off_t
 	#define off_t	off64_t
-	#endif
 	#if _lib_statvfs64 && !defined(statvfs)
 	#define statvfs		statvfs64
 	#if !defined(__USE_LARGEFILE64)
@@ -224,6 +223,7 @@ cat{
 	extern int		fstatvfs64(int, struct statvfs64*);
 	#endif
 	#endif
+	#endif /* _typ_off64_t */
 }end
 
 str	st_fstype sys/types.h sys/stat.h note{ stat.st_fstype is a string }end compile{

src/lib/libast/features/lib

@@ -37,9 +37,9 @@ lib	strchr,strcoll,strdup,strerror,strcasecmp,strncasecmp,strrchr,strstr
 lib	strmode,strxfrm,strftime,swab,symlink,sysconf,sysinfo,syslog
 lib	telldir,tmpnam,tzset,universe,unlink,utime,wctype
 lib	ftruncate,truncate
-lib	creat64,fstat64,fstatvfs64,ftruncate64 -D_LARGEFILE64_SOURCE
+lib	creat64,fstat64,fstatvfs64,ftruncate64
-lib	lseek64,lstat64 -D_LARGEFILE64_SOURCE
+lib	lseek64,lstat64
-lib	open64,readdir64,stat64,statvfs64,truncate64 -D_LARGEFILE64_SOURCE
+lib	open64,readdir64,stat64,statvfs64,truncate64
 
 lib,npt	strtod,strtold,strtol,strtoll,strtoul,strtoull stdlib.h
 lib,npt	sigflag signal.h
@@ -53,8 +53,8 @@ mem	inheritance.pgroup spawn.h
 sys	dir,filio,jioctl,localedef,ptem,resource
 sys	socket,stream,systeminfo,universe,vfork
 
-typ	ino64_t,off64_t -D_LARGEFILE64_SOURCE
+typ	ino64_t,off64_t
-typ	struct.dirent64 -D_LARGEFILE64_SOURCE dirent.h
+typ	struct.dirent64 dirent.h
 
 tst	tst_errno note{ errno can be assigned }end link{
 	_BEGIN_EXTERNS_
@@ -703,7 +703,7 @@ tst	- output{
 	echo '#error The output block in src/lib/libast/features/lib failed to compile. Rebuild with IFFEFLAGS=-d1 to debug.'
 }end
 
-tst	no64 -D_LARGEFILE64_SOURCE note{ largefile 64 broken }end execute{
+tst	no64 note{ largefile 64 broken }end execute{
 	#include <sys/types.h>
 	#include <sys/stat.h>
 	int
@@ -726,7 +726,7 @@ tst	no64 -D_LARGEFILE64_SOURCE note{ largefile 64 broken }end execute{
 	echo "#undef	_lib_truncate64"
 }end
 
-tst	need64 -D_LARGEFILE64_SOURCE note{ off64_t necessary }end nocompile{
+tst	need64 note{ off64_t necessary }end nocompile{
 	#include <sys/types.h>
 	typedef off64_t __ast_off64_t__;
 	typedef off_t __ast_off_t__;

src/lib/libast/features/mmap

@@ -118,7 +118,7 @@ tst	lib_mmap note{ standard mmap interface that works }end execute{
 	}
 }end
 
-tst	lib_mmap64 -D_LARGEFILE64_SOURCE note{ mmap64 interface and implementation work }end execute{
+tst	lib_mmap64 note{ mmap64 interface and implementation work }end execute{
 	#if !_lib_mmap
 	(
 	#endif