Revert "[RenderScript] remove redundant build flag"

This reverts commit eb4a9973aa9c5273c496caae28298add4694c039.

Change-Id: I621908ac03dda1403dc963dfb5b1ac27fedae941
diff --git a/v8/renderscript/rs_support/Android.mk b/v8/renderscript/rs_support/Android.mk
index 0ff5f05..be3f47d 100644
--- a/v8/renderscript/rs_support/Android.mk
+++ b/v8/renderscript/rs_support/Android.mk
@@ -159,7 +159,7 @@
 LOCAL_C_INCLUDES += external/cblas/include
 LOCAL_C_INCLUDES += external/gemmlowp/eight_bit_int_gemm
 
-LOCAL_CFLAGS += $(rs_base_CFLAGS)
+LOCAL_CFLAGS += $(rs_base_CFLAGS) -DGEMMLOWP_USE_OLD_ANDROID_SDK
 
 LOCAL_MODULE:= libRSSupport
 LOCAL_MODULE_TAGS := optional