do not hardcode the apk path

The apk path is hardcoded, but it is in fact placed inside the build
path. This patch changes it, so the apk path is calculated from the
build path.

This patch does not change any behavior. However, it allows future
changes to build path to automaticly reflect on the apk path.

Android.mk

@@ -22,19 +22,19 @@ LOCAL_PACKAGE_NAME := GmsCore
 gmscore_root  := $(LOCAL_PATH)
 gmscore_dir   := play-services-core
 gmscore_out   := $(TARGET_COMMON_OUT_ROOT)/obj/APPS/$(LOCAL_MODULE)_intermediates
-gmscore_build := $(gmscore_root)/$(gmscore_dir)/build
-gmscore_apk   := build/outputs/apk/release/play-services-core-release-unsigned.apk
+gmscore_build := $(gmscore_dir)/build
+gmscore_apk   := $(gmscore_build)/outputs/apk/release/play-services-core-release-unsigned.apk
 
-$(gmscore_root)/$(gmscore_dir)/$(gmscore_apk):
-	rm -Rf $(gmscore_build)
+$(gmscore_root)/$(gmscore_apk):
+	rm -Rf $(gmscore_root)/$(gmscore_build)
 	mkdir -p $(ANDROID_BUILD_TOP)/$(gmscore_out)
-	ln -s $(ANDROID_BUILD_TOP)/$(gmscore_out) $(ANDROID_BUILD_TOP)/$(gmscore_build)
+	ln -s $(ANDROID_BUILD_TOP)/$(gmscore_out) $(ANDROID_BUILD_TOP)/$(gmscore_root)/$(gmscore_build)
 	echo "sdk.dir=$(ANDROID_HOME)" > $(gmscore_root)/local.properties
 	cd $(gmscore_root) && git submodule update --recursive --init
 	cd $(gmscore_root)/$(gmscore_dir) && JAVA_TOOL_OPTIONS="$(JAVA_TOOL_OPTIONS) -Dfile.encoding=UTF8" ../gradlew assembleRelease
 
 LOCAL_CERTIFICATE := platform
-LOCAL_SRC_FILES := $(gmscore_dir)/$(gmscore_apk)
+LOCAL_SRC_FILES := $(gmscore_apk)
 LOCAL_MODULE_CLASS := APPS
 LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)