Don't try to fully tear down program in terminate()

bug:19277550

The program will be destroyed anyway by nature of the program cache cleanup.

Change-Id: I304becd34fdf40baf314bae8b37d2c072ad44409

libs/hwui/Caches.cpp

@@ -199,7 +199,7 @@ void Caches::terminate() {
     fboCache.clear();
 
     programCache.clear();
-    setProgram(nullptr);
+    mProgram = nullptr;
 
     patchCache.clear();