Revert "coreboot: never, ever use Werror"

This reverts commit 2ecfe63b5f.

config/submodule/coreboot/fam15h/vboot/patches/0001-disable-werror.patch

@@ -1,26 +0,0 @@
-From deefd0af4b4d5a84e048ac57be2a9a8cffe16192 Mon Sep 17 00:00:00 2001
-From: Leah Rowe <leah@libreboot.org>
-Date: Thu, 23 Apr 2026 21:30:49 +0100
-Subject: [PATCH 1/1] disable werror
-
-Signed-off-by: Leah Rowe <leah@libreboot.org>
----
- Makefile | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/Makefile b/Makefile
-index 0539e8d7..ea5e9c68 100644
---- a/Makefile
-+++ b/Makefile
-@@ -136,7 +136,7 @@ endif
- #
- # Flag ordering: arch, then -f, then -m, then -W
- DEBUG_FLAGS := $(if ${DEBUG},-g -O0,-g -Os)
--WERROR := -Werror
-+WERROR :=
- FIRMWARE_FLAGS := -nostdinc -ffreestanding -fno-builtin -fno-stack-protector
- COMMON_FLAGS := -pipe ${WERROR} -Wall -Wstrict-prototypes -Wtype-limits \
- 	-Wundef -Wmissing-prototypes -Wno-trigraphs -Wredundant-decls -Wshadow \
--- 
-2.47.3
-