Revert 335888 ("Ensure va_list is declared by including stdarg.h.")

The issue was caused by header pollution brought by GCC 8.1.

We now have to remove include-fixed headers in the GCC installation
directory.

Sponsored by:	DARPA, AFRL
Pointed out by:	jhb

contrib/blacklist/bin/blacklistctl.c

@@ -35,7 +35,6 @@
 #include <sys/cdefs.h>
 __RCSID("$NetBSD: blacklistctl.c,v 1.21 2016/11/02 03:15:07 jnemeth Exp $");
 
-#include <stdarg.h>
 #include <stdio.h>
 #include <time.h>
 #ifdef HAVE_LIBUTIL_H

lib/libpjdlog/pjdlog.c

@@ -43,8 +43,8 @@ __FBSDID("$FreeBSD$");
 #include <errno.h>
 #include <libutil.h>
 #include <limits.h>
-#include <stdarg.h>
 #include <printf.h>
+#include <stdarg.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>

sbin/hastd/pjdlog.c

@@ -41,8 +41,8 @@ __FBSDID("$FreeBSD$");
 #include <assert.h>
 #include <errno.h>
 #include <libutil.h>
-#include <stdarg.h>
 #include <printf.h>
+#include <stdarg.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>