depends: Introduce customizable $(package)_patches_path variables

This change helps avoid patch duplication between a package and its
native counterpart.

Author: hebasto

depends/funcs.mk

@@ -40,7 +40,8 @@ define fetch_file
 endef
 
 define int_get_build_recipe_hash
-$(eval $(1)_all_file_checksums:=$(shell $(build_SHA256SUM) $(meta_depends) packages/$(1).mk $(addprefix $(PATCHES_PATH)/$(1)/,$($(1)_patches)) | cut -d" " -f1))
+$(eval $(1)_patches_path?=$(PATCHES_PATH)/$(1))
+$(eval $(1)_all_file_checksums:=$(shell $(build_SHA256SUM) $(meta_depends) packages/$(1).mk $(addprefix $($(1)_patches_path)/,$($(1)_patches)) | cut -d" " -f1))
 $(eval $(1)_recipe_hash:=$(shell echo -n "$($(1)_all_file_checksums)" | $(build_SHA256SUM) | cut -d" " -f1))
 endef
 
@@ -219,7 +220,7 @@ $($(1)_extracted): | $($(1)_fetched)
 $($(1)_preprocessed): | $($(1)_extracted)
 	echo Preprocessing $(1)...
 	mkdir -p $$(@D) $($(1)_patch_dir)
-	$(foreach patch,$($(1)_patches),cd $(PATCHES_PATH)/$(1); cp $(patch) $($(1)_patch_dir) ;)
+	$(foreach patch,$($(1)_patches),cd $($(1)_patches_path); cp $(patch) $($(1)_patch_dir) ;)
 	{ cd $$(@D); $($(1)_preprocess_cmds); } $$($(1)_logging)
 	touch $$@
 $($(1)_configured): | $($(1)_dependencies) $($(1)_preprocessed)