add kernel_headers dependency on target/linux/generic-2.*

SVN-Revision: 6362

toolchain/kernel-headers/Makefile

@@ -14,6 +14,7 @@ PKG_SOURCE=$(LINUX_SOURCE)
 PKG_SOURCE_URL=$(LINUX_SITE)
 
 PKG_BUILD_DIR:=$(TOOLCHAIN_BUILD_DIR)/linux-$(PKG_VERSION)
+PKG_FILE_DEPEND:=$(GENERIC_PLATFORM_DIR)
 
 include $(INCLUDE_DIR)/host-build.mk