Ignore testcases' NOTICE files

$(BUILD_NATIVE_TEST) will install a test binary into /testcases
regardless of is proprietary or not.
For now, since NOTICE.xml for a system partition depends on all modules in
/testcases, "m systemimage" may trigger "installing a proprietary test".

Modules in /testcase are not actually installed, so we can ignore them
when we make a notice file.

Bug: 133454731
Test: (internal) m systemimage, and see /vendor/lib if there are
unexpected files installed.

Change-Id: I54ee51a761049b8a5ce9e3369b30b7ade6344146
diff --git a/core/Makefile b/core/Makefile
index a4825e1..a9224a2 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1145,6 +1145,8 @@
 license_modules := $(ALL_DEFAULT_INSTALLED_MODULES) $(kernel_notice_file) $(pdk_fusion_notice_files)
 # Phonys/fakes don't have notice files (though their deps might)
 license_modules := $(filter-out $(TARGET_OUT_FAKE)/%,$(license_modules))
+# testcases are not relevant to the system image.
+license_modules := $(filter-out $(TARGET_OUT_TESTCASES)/%,$(license_modules))
 license_modules_vendor := $(filter $(TARGET_OUT_VENDOR)/%,$(license_modules))
 license_modules_product := $(filter $(TARGET_OUT_PRODUCT)/%,$(license_modules))
 license_modules_product_services := $(filter $(TARGET_OUT_PRODUCT_SERVICES)/%,$(license_modules))