Provide mechanism to override llvm-rs-cc headers.

Change-Id: I87fd496069a9dfde633e2d232e436fa5d7315cc0
diff --git a/core/java.mk b/core/java.mk
index 677e3de..1b15720 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -166,6 +166,10 @@
     $(LOCAL_RENDERSCRIPT_INCLUDES)
 endif
 
+ifneq ($(LOCAL_RENDERSCRIPT_INCLUDES_OVERRIDE),)
+LOCAL_RENDERSCRIPT_INCLUDES := $(LOCAL_RENDERSCRIPT_INCLUDES_OVERRIDE)
+endif
+
 $(RenderScript_file_stamp): PRIVATE_RS_INCLUDES := $(LOCAL_RENDERSCRIPT_INCLUDES)
 $(RenderScript_file_stamp): PRIVATE_RS_CC := $(LOCAL_RENDERSCRIPT_CC)
 $(RenderScript_file_stamp): PRIVATE_RS_SOURCE_FILES := $(renderscript_sources_fullpath)