[PATCH] Make more of stdlib.h visible if _NETBSD_SOURCE isn't defined

[coypu%sdf.org@localhost]

... This is some progress towards the previous patch being viable,
however I'll have to patch libstdc++ and a bunch of other things, too.

----


Move the big "if _NETBSD_SOURCE" chunk to the "Implementation defined" section.
Makes "at_quick_exit" and others visible for strict C/C++.

Index: stdlib.h
===================================================================
RCS file: /cvsroot/src/include/stdlib.h,v
retrieving revision 1.122
diff -u -r1.122 stdlib.h
--- stdlib.h	26 May 2020 21:49:29 -0000	1.122
+++ stdlib.h	30 Aug 2020 11:48:26 -0000
@@ -136,9 +136,6 @@
 int	 mbtowc(wchar_t * __restrict, const char * __restrict, size_t);
 size_t	 wcstombs(char * __restrict, const wchar_t * __restrict, size_t);
 
-#if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE) || \
-    defined(_NETBSD_SOURCE)
-
 
 /*
  * IEEE Std 1003.1c-95, also adopted by X/Open CAE Spec Issue 5 Version 2
@@ -258,7 +255,8 @@
 /*
  * Implementation-defined extensions
  */
-#if defined(_NETBSD_SOURCE)
+#if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE) || \
+    defined(_NETBSD_SOURCE)
 #if defined(alloca) && (alloca == __builtin_alloca) && \
 	defined(__GNUC__) && (__GNUC__ < 2)
 void	*alloca(int);     /* built-in for gcc */
@@ -345,7 +343,6 @@
 size_t	shquotev(int, char * const *, char *, size_t);
 
 int	reallocarr(void *, size_t, size_t);
-#endif /* _NETBSD_SOURCE */
 #endif /* _POSIX_C_SOURCE || _XOPEN_SOURCE || _NETBSD_SOURCE */
 
 #if defined(_NETBSD_SOURCE)