Switch libnativebridge to clang

This fixes the mac build.

(cherry picked from commit 935708be6fe366c8e519b01d1fba9fd2414c0dba)

Change-Id: I246a1c0af2124ed1cec653f2f44ca256f26534ff
diff --git a/libnativebridge/Android.mk b/libnativebridge/Android.mk
index 8209bc7..017ce02 100644
--- a/libnativebridge/Android.mk
+++ b/libnativebridge/Android.mk
@@ -10,6 +10,7 @@
 LOCAL_MODULE:= libnativebridge
 
 LOCAL_SRC_FILES:= $(NATIVE_BRIDGE_COMMON_SRC_FILES)
+LOCAL_CLANG := true
 LOCAL_CPP_EXTENSION := .cc
 LOCAL_CFLAGS := -Werror
 LOCAL_CPPFLAGS := -std=gnu++11
@@ -25,6 +26,7 @@
 LOCAL_MODULE:= libnativebridge
 
 LOCAL_SRC_FILES:= $(NATIVE_BRIDGE_COMMON_SRC_FILES)
+LOCAL_CLANG := true
 LOCAL_CPP_EXTENSION := .cc
 LOCAL_CFLAGS := -Werror
 LOCAL_CPPFLAGS := -std=gnu++11