increase -Werror resilience

for bin/, commands/, libexec/, sbin/, test/, usr.bin/ and usr.sbin/.

Change-Id: I8fa12c3cd86865311cef71b7faa7cf4fa785174f

sbin/fsck/Makefile

@@ -12,5 +12,6 @@ DPADD+=${LIBPROP}
 
 # LSC Does not compile without any warnings...
 NOGCCERROR:=yes
+NOCLANGERROR:=yes
 
 .include <bsd.prog.mk>

sbin/fsck/fsutil.c

@@ -265,8 +265,13 @@ print_mtime(time_t t)
 }
 
 
+#ifdef __minix
+__dead void
+catch(int n)
+#else
 void
 catch(int n)
+#endif
 {
 	if (ckfinish) (*ckfinish)(0);
 	_exit(FSCK_EXIT_SIGNALLED);

sbin/newfs_ext2fs/Makefile

@@ -1,6 +1,10 @@
 #	$NetBSD: Makefile,v 1.4 2012/03/24 08:22:24 joerg Exp $
 #	@(#)Makefile	8.2 (Berkeley) 3/27/94
 
+.if defined(__MINIX)
+WARNS=3
+.endif
+
 WARNS?=	4
 
 CWARNFLAGS+=	-Wno-sign-compare