opengles renderer: added CHECK_GL_ERROR defie for gl debugging

This commit add CHECK_GL_ERROR define to decoders/renderer which enables various
glGetError() calls. Also changed emugen to add glGetError() after every dispatch call (based on
defintion of CHECK_GL_ERROR). Also cleaned some annoying printf's.

tools/emulator/opengl/host/renderer/main.cpp

@@ -92,8 +92,12 @@ int main(int argc, char *argv[])
         printUsage(argv[0]);
     }
 
-    printf("renderer pid %d , press any key to continue...\n", getpid());
+#if 0 //Enable to attach gdb to renderer on startup
+    fprintf(stderr, "renderer pid %d , press any key to continue...\n", getpid());
     getchar();
+#else
+    fprintf(stderr, "renderer pid %d \n", getpid());
+#endif
 
 #ifdef _WIN32
     WSADATA  wsaData;