Switch to use rs_version.mk for consistency.

Change-Id: Ia19bb2f56653b10741d8b508c3dc3f93ce1c1495
diff --git a/Android.mk b/Android.mk
index bd465d6..5427f3b 100644
--- a/Android.mk
+++ b/Android.mk
@@ -21,6 +21,8 @@
 LIBBCC_ROOT_PATH := $(LOCAL_PATH)
 include $(LIBBCC_ROOT_PATH)/libbcc.mk
 
+include frameworks/compile/slang/rs_version.mk
+
 #=====================================================================
 # Whole Static Library to Be Linked In
 #=====================================================================