libs, kernel and commands: re-enable -Werror

sys/src/lib/jehanne/build.json

@@ -147,7 +147,6 @@
 			"port/fmod.c",
 			"port/frand.c",
 			"port/frexp.c",
-			"port/getcallerpc.c",
 			"port/getfields.c",
 			"port/getuser.c",
 			"port/hangup.c",

sys/src/lib/jehanne/klibc.json

@@ -64,7 +64,6 @@
 			"port/fmod.c",
 			"port/frand.c",
 			"port/frexp.c",
-			"port/getcallerpc.c",
 			"port/getfields.c",
 			"port/hypot.c",
 			"port/lnrand.c",

sys/src/lib/jehanne/port/getcallerpc.c

@@ -1,17 +0,0 @@
-/*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
-
-#include <u.h>
-#include <libc.h>
-
-uintptr_t
-jehanne_getcallerpc(void)
-{
-	return (uintptr_t)__builtin_return_address(2);
-}