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/ProgramCache.cpp b/libs/hwui/ProgramCache.cpp
index 06353c0..a591150 100644
--- a/libs/hwui/ProgramCache.cpp
+++ b/libs/hwui/ProgramCache.cpp
@@ -455,7 +455,7 @@
 // Program generation
 ///////////////////////////////////////////////////////////////////////////////
 
-Program* ProgramCache::generateProgram(const ProgramDescription& description, programid key) {
+Program* ProgramCache::generateProgram(const ProgramDescription& description, programid /* key */) {
     String8 vertexShader = generateVertexShader(description);
     String8 fragmentShader = generateFragmentShader(description);