Add DISABLE_LLVM_DEVICE_BUILDS to libbcc.

Change-Id: Iaad7b2ea8eea6c89c1c1a3d0e145bbb7bf60c6b9
diff --git a/lib/Renderscript/Android.mk b/lib/Renderscript/Android.mk
index 1f77e0b..357571f 100644
--- a/lib/Renderscript/Android.mk
+++ b/lib/Renderscript/Android.mk
@@ -36,7 +36,7 @@
 #=====================================================================
 # Device Static Library: libbccRenderscript
 #=====================================================================
-
+ifneq (true,$(DISABLE_LLVM_DEVICE_BUILDS))
 include $(CLEAR_VARS)
 
 # not supported on 64-bit yet
@@ -52,7 +52,7 @@
 include $(LIBBCC_GEN_CONFIG_MK)
 include $(LLVM_DEVICE_BUILD_MK)
 include $(BUILD_STATIC_LIBRARY)
-
+endif
 
 #=====================================================================
 # Host Static Library: libbccRenderscript