kernel: reduce spurious rebuilds of simple kmod-* packages

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 37403

package/kernel/linux/Makefile

@@ -18,6 +18,9 @@ PKG_LICENSE:=GPLv2
 PKG_LICENSE_FILES:=
 
 include $(INCLUDE_DIR)/package.mk
+
+STAMP_BUILT:=$(STAMP_BUILT)_$(firstword $(shell $(SCRIPT_DIR)/kconfig.pl $(LINUX_DIR)/.config | md5sum))
+
 ifeq ($(DUMP),)
   -include $(LINUX_DIR)/.config
 endif
@@ -32,6 +35,9 @@ endef
 define Build/Compile
 endef
 
+define KernelPackage/depends
+endef
+
 CONFIG_PACKAGE_kernel=y
 define Package/kernel
   SECTION:=sys