Frameworks/base: Unused parameters in hwui

Remove Clang cutout for unused parameters. Fix warnings.

Remove Clang cutout for deprecated Skia function usage. Has been
fixed in the L push.

Change-Id: I7ea073ff67127cc1e14e798b655e2c50615fe8e7
diff --git a/libs/hwui/renderthread/RenderThread.cpp b/libs/hwui/renderthread/RenderThread.cpp
index 403e164..1be4a97 100644
--- a/libs/hwui/renderthread/RenderThread.cpp
+++ b/libs/hwui/renderthread/RenderThread.cpp
@@ -171,7 +171,7 @@
     mRenderState = new RenderState();
 }
 
-int RenderThread::displayEventReceiverCallback(int fd, int events, void* data) {
+int RenderThread::displayEventReceiverCallback(int /* fd */, int events, void* data) {
     if (events & (Looper::EVENT_ERROR | Looper::EVENT_HANGUP)) {
         ALOGE("Display event receiver pipe was closed or an error occurred.  "
                 "events=0x%x", events);