pixelflinger-twrp: don't build with clang

Change-Id: I742078841ae51fff9ce412279cd03805f4893981
diff --git a/libpixelflinger/Android.mk b/libpixelflinger/Android.mk
index 99f026c..384591e 100644
--- a/libpixelflinger/Android.mk
+++ b/libpixelflinger/Android.mk
@@ -89,6 +89,7 @@
 #
 
 include $(CLEAR_VARS)
+LOCAL_CLANG := false
 LOCAL_MODULE:= libpixelflinger_twrp
 LOCAL_SRC_FILES := $(PIXELFLINGER_SRC_FILES)
 LOCAL_SRC_FILES_arm := $(PIXELFLINGER_SRC_FILES_arm)