Revert "Use clang for libhwui"

Bug 25462107

This reverts commit d354fd2c66855d116440eb4c936317f124241225.

Change-Id: Ib7c50b5becf247f837f3cc20f9128d9411d22563
diff --git a/libs/hwui/Android.common.mk b/libs/hwui/Android.common.mk
index c80f2cf..38e8be9 100644
--- a/libs/hwui/Android.common.mk
+++ b/libs/hwui/Android.common.mk
@@ -1,9 +1,6 @@
 # getConfig in external/skia/include/core/SkBitmap.h is deprecated.
 # Allow Gnu extension: in-class initializer of static 'const float' member.
 # DeferredLayerUpdater.h: private field 'mRenderThread' is not used.
-
-LOCAL_CLANG := true
-
 LOCAL_CLANG_CFLAGS += \
     -Wno-deprecated-declarations \
     -Wno-gnu-static-float-init \