Patch from Nathan Stocks, Issue 579:Failing to load libraries that exist but have fatal problems is _silently_ ignored on Linux and OS X.
Patch from Nathan Stocks, Issue 579:Failing to load libraries that exist but have fatal problems is _silently_ ignored on Linux and OS X.

niklaskorz/pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet,niklaskorz/pyglet,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet,adamlwgriffiths/Pyglet