This patch removes a bunch of superfluous #include directives: if

postgres.h or c.h includes a system header (such as stdio.h or
stdlib.h), there's no need to specifically include it in any of the .c
files in the backend.

Neil Conway

src/backend/regex/regcomp.c

@@ -47,7 +47,6 @@
 #include "regex/utils.h"
 #include "regex/regex2.h"
 #include "regex/cname.h"
-#include <locale.h>
 
 struct cclass
 {