Compile libsurfaceflinger with Clang and -std=c++11 [DO NOT MERGE]

This is necessary to use C11/C++11 stdlib atomics, which the next
change will do. This change also fixes a couple bits of syntax that
both GCC and Clang refuse to compile in -std=c++11 mode.

Change-Id: Ia14d9d6b537a3bb106c23e19a277e48be180754c
diff --git a/services/surfaceflinger/Android.mk b/services/surfaceflinger/Android.mk
index 0e15506..888d2f8 100644
--- a/services/surfaceflinger/Android.mk
+++ b/services/surfaceflinger/Android.mk
@@ -1,6 +1,8 @@
 LOCAL_PATH:= $(call my-dir)
 include $(CLEAR_VARS)
 
+LOCAL_CLANG := true
+
 LOCAL_SRC_FILES:= \
     Client.cpp \
     DisplayDevice.cpp \
@@ -81,6 +83,7 @@
 endif
 
 LOCAL_CFLAGS += -fvisibility=hidden
+LOCAL_CFLAGS += -std=c++11
 
 LOCAL_SHARED_LIBRARIES := \
 	libcutils \