coreboot: never, ever use Werror

not even once

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/submodule/coreboot/default/vboot/patches/0002-disable-werror.patch

@@ -0,0 +1,48 @@
+From 9ea31d19a31c4fa40e386c104286dd76d60260bb Mon Sep 17 00:00:00 2001
+From: Leah Rowe <leah@libreboot.org>
+Date: Thu, 23 Apr 2026 20:46:37 +0100
+Subject: [PATCH 1/1] disable werror
+
+Signed-off-by: Leah Rowe <leah@libreboot.org>
+---
+ Android.bp | 1 -
+ Makefile   | 4 ++--
+ 2 files changed, 2 insertions(+), 3 deletions(-)
+
+diff --git a/Android.bp b/Android.bp
+index dec72cc8..1974a1a2 100644
+--- a/Android.bp
++++ b/Android.bp
+@@ -9,7 +9,6 @@ cc_defaults {
+ 
+     cflags: [
+         "-Wall",
+-        "-Werror",
+         "-Wstrict-prototypes",
+         "-Wtype-limits",
+         "-Wundef",
+diff --git a/Makefile b/Makefile
+index 67af60d4..cdc63c5e 100644
+--- a/Makefile
++++ b/Makefile
+@@ -113,7 +113,7 @@ endif
+ # Provide default CC and CFLAGS for firmware builds; if you have any -D flags,
+ # please add them after this point (e.g., -DVBOOT_DEBUG).
+ DEBUG_FLAGS := $(if $(filter-out 0,${DEBUG}),-g -Og,-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 \
+@@ -127,7 +127,7 @@ COMMON_FLAGS := -pipe ${WERROR} -Wall -Wstrict-prototypes -Wtype-limits \
+ # returns: $(1) if compiler was successful, empty string otherwise
+ test_ccflag = $(shell \
+ 	printf "$(2)\nvoid _start(void) {}\n" | \
+-	$(CC) -nostdlib -Werror $(1) -xc -c - -o /dev/null \
++	$(CC) -nostdlib $(1) -xc -c - -o /dev/null \
+ 	>/dev/null 2>&1 && echo "$(1)")
+ 
+ COMMON_FLAGS += $(call test_ccflag,-Wimplicit-fallthrough)
+-- 
+2.47.3
+