Fixed OpenGL usage in Quartz target when SDL_SetVideoMode() is called without

 explicitly calling SDL_GL_LoadLibrary() first.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401198

src/video/quartz/SDL_QuartzGL.m

@@ -57,6 +57,12 @@ int QZ_SetupOpenGL (_THIS, int bpp, Uint32 flags) {
     int i = 0;
     int colorBits = bpp;
 
+    /* if a GL library hasn't been loaded at this point, load the default. */
+    if (!this->gl_config.driver_loaded) {
+        if (QZ_GL_LoadLibrary(this, NULL) == -1)
+            return 0;
+    }
+
     if ( flags & SDL_FULLSCREEN ) {
 
         attr[i++] = NSOpenGLPFAFullScreen;
@@ -151,9 +157,6 @@ int QZ_SetupOpenGL (_THIS, int bpp, Uint32 flags) {
 
     /* End Wisdom from Apple Engineer section. --ryan. */
 
-    /* Convince SDL that the GL "driver" is loaded */
-    this->gl_config.driver_loaded = 1;
-
     return 1;
 }