Move libgiftranscode.so to /product

libgiftranscode.so is a jni lib for Messaging app, which is usually
overridden by proprietary apps on shipping devices. We have moved
Messaging to /product. Now this CL move libgiftranscode.so too.

Bug: 138282284
Test: Open gif files with Messaging on aosp_crosshatch
Change-Id: Ic104ba8ec5c2258a28c8d19151a00f6c601b5f80

CleanSpec.mk

@@ -39,3 +39,5 @@
 # ************************************************
 
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/messaging)
+$(call add-clean-step, rm -f $(PRODUCT_OUT)/system/lib/libgiftranscode.so)
+$(call add-clean-step, rm -f $(PRODUCT_OUT)/system/lib64/libgiftranscode.so)

jni/Android.mk

@@ -32,4 +32,6 @@ LOCAL_CFLAGS += -Wall -Werror -Wno-unused-parameter -Wno-switch
 LOCAL_SDK_VERSION := 19
 LOCAL_NDK_STL_VARIANT := c++_static # LLVM libc++
 
+LOCAL_PRODUCT_MODULE := true
+
 include $(BUILD_SHARED_LIBRARY)