Enable clang for libui/libgui/surfaceflinger

Enables clang and C++11 for libui/libgui/surfaceflinger, and
eliminates all compile-time warnings.

Change-Id: Ie237fdb5ae44f2bfcddaa884f9c65ec3f08ae50f
diff --git a/libs/gui/SensorEventQueue.cpp b/libs/gui/SensorEventQueue.cpp
index 1305e9f..6f5f204 100644
--- a/libs/gui/SensorEventQueue.cpp
+++ b/libs/gui/SensorEventQueue.cpp
@@ -157,7 +157,7 @@
         ssize_t size = ::send(mSensorChannel->getFd(), &mNumAcksToSend, sizeof(mNumAcksToSend),
                 MSG_DONTWAIT | MSG_NOSIGNAL);
         if (size < 0) {
-            ALOGE("sendAck failure %d %d", size, mNumAcksToSend);
+            ALOGE("sendAck failure %zd %d", size, mNumAcksToSend);
         } else {
             mNumAcksToSend = 0;
         }