Merging r6426 through r6466 from trunk to ogl-es branch

Note: Updated IShaderConstantSetCallBack not yet supported by ogl-es drivers


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6467 dfc29bdd-3216-0410-991c-e03cc46cb475

examples/02.Quake3Map/main.cpp

@@ -168,6 +168,7 @@ int main()
 				device->setWindowCaption(str.c_str());
 				lastFPS = fps;
 			}
+			device->yield();
 		}
 		else
 			device->yield();