Merge "Turn unused source files from warning to error"

my_unused_src_files := $(filter-out $(logtags_sources) $(my_tracked_src_files),$(my_src_files) $(my_gen_src_files))

ifneq ($(my_unused_src_files),)

  $(warning $(LOCAL_MODULE_MAKEFILE): $(LOCAL_MODULE): Unused source files: $(my_unused_src_files))

  $(error $(LOCAL_MODULE_MAKEFILE): $(LOCAL_MODULE): Unused source files: $(my_unused_src_files))

endif

# some rules depend on asm_objects being first.  If your code depends on