Clean unused parameters, disable warnings

Change-Id: Iddb872f53075dd022eeef45265594d1c6a9e2bc0
diff --git a/libs/hwui/font/CacheTexture.h b/libs/hwui/font/CacheTexture.h
index 61b38f8..4cc4f22 100644
--- a/libs/hwui/font/CacheTexture.h
+++ b/libs/hwui/font/CacheTexture.h
@@ -54,7 +54,7 @@
     CacheBlock* mNext;
     CacheBlock* mPrev;
 
-    CacheBlock(uint16_t x, uint16_t y, uint16_t width, uint16_t height, bool empty = false):
+    CacheBlock(uint16_t x, uint16_t y, uint16_t width, uint16_t height):
             mX(x), mY(y), mWidth(width), mHeight(height), mNext(NULL), mPrev(NULL) {
     }