ltq-adsl: silence missing-prototypes warnings

There are a lot of missing-prototypes warnings, It's not worth to
fix them one by one. Let us just ignore them.

Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18744
Signed-off-by: Robert Marko <[email protected]>

package/kernel/lantiq/ltq-adsl/patches/412-silence-missing-prototypes-warnings.patch

@@ -0,0 +1,32 @@
+From: Shiji Yang <[email protected]>
+Date: Fri, 9 May 2025 20:58:09 +0800
+Subject: [PATCH] silence missing-prototypes warnings
+
+This patch silences various missing-prototypes build warnings on
+6.12 kernel.
+
+Signed-off-by: Shiji Yang <[email protected]>
+---
+ src/Makefile.am | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+--- a/src/Makefile.am
++++ b/src/Makefile.am
+@@ -299,6 +299,8 @@ if KERNEL_2_6
+ 
+ drv_dsl_cpe_api_OBJS = "$(subst .c,.o,$(filter %.c,$(drv_dsl_cpe_api_SOURCES)))"
+ 
++PKGFIX_CFLAGS = -Wno-error=missing-prototypes
++
+ drv_dsl_cpe_api.ko: $(drv_dsl_cpe_api_SOURCES)
+ 	@echo "drv_dsl_cpe_api: Making Linux 2.6.x kernel object"
+ 	if test ! -e common/drv_dsl_cpe_api.c ; then \
+@@ -311,7 +313,7 @@ drv_dsl_cpe_api.ko: $(drv_dsl_cpe_api_SO
+ 	@echo "# drv_dsl_cpe_api: Generated to build Linux 2.6.x kernel object" > $(PWD)/Kbuild
+ 	@echo "obj-m := $(subst .ko,.o,$@)"			>> $(PWD)/Kbuild
+ 	@echo "$(subst .ko,,$@)-y := $(drv_dsl_cpe_api_OBJS)"	>> $(PWD)/Kbuild
+-	@echo "EXTRA_CFLAGS := -DHAVE_CONFIG_H $(drv_dsl_cpe_api_CFLAGS) $(DSL_DRIVER_INCL_PATH) $(IFXOS_INCLUDE_PATH) -I@abs_srcdir@/include -I$(PWD)/include"	>> $(PWD)/Kbuild
++	@echo "EXTRA_CFLAGS := -DHAVE_CONFIG_H $(drv_dsl_cpe_api_CFLAGS) $(PKGFIX_CFLAGS) $(DSL_DRIVER_INCL_PATH) $(IFXOS_INCLUDE_PATH) -I@abs_srcdir@/include -I$(PWD)/include"	>> $(PWD)/Kbuild
+ 	$(MAKE) ARCH=@KERNEL_ARCH@ -C @KERNEL_BUILD_PATH@ O=@KERNEL_BUILD_PATH@ M=$(PWD) modules
+ 
+ clean-generic: