Add a "relaxed" mode for require-artifacts-in-path

This is useful when a makefile will produces different artifacts
depending on other configuration. Having an allow-list that's too strict
can make it a little  difficult to make progress.

Test: m nothing in follow-up
Change-Id: Ic8235912bcbaa8e249a752e042d4f42be4466e34
(cherry picked from commit 0b6fde311ac6bc2b64e69858382117a362645502)

core/artifact_path_requirements.mk

@@ -35,7 +35,9 @@ $(foreach makefile,$(ARTIFACT_PATH_REQUIREMENT_PRODUCTS),\
     $(makefile) produces files outside its artifact path requirement. \
     Allowed paths are $(subst $(space),$(comma)$(space),$(addsuffix *,$(requirements)))) \
   $(eval unused_allowed := $(filter-out $(files),$(allowed_patterns))) \
+  $(if $(PRODUCTS.$(makefile).ARTIFACT_PATH_REQUIREMENT_IS_RELAXED),, \
     $(call maybe-print-list-and-error,$(unused_allowed),$(makefile) includes redundant allowed entries in its artifact path requirement.) \
+  ) \
   $(eval ### Optionally verify that nothing else produces files inside this artifact path requirement.) \
   $(eval extra_files := $(filter-out $(files) $(HOST_OUT)/%,$(product_target_FILES))) \
   $(eval files_in_requirement := $(filter $(path_patterns),$(extra_files))) \

core/product.mk

@@ -463,6 +463,13 @@ define require-artifacts-in-path
     $(sort $(ARTIFACT_PATH_REQUIREMENT_PRODUCTS) $(current_mk)))
 endef
 
+# Like require-artifacts-in-path, but does not require all allow-list entries to
+# have an effect.
+define require-artifacts-in-path-relaxed
+  $(require-artifacts-in-path) \
+  $(eval PRODUCTS.$(current_mk).ARTIFACT_PATH_REQUIREMENT_IS_RELAXED := true)
+endef
+
 # Makes including non-existent modules in PRODUCT_PACKAGES an error.
 # $(1): list of non-existent modules to allow.
 define enforce-product-packages-exist