Remove the remaining calls to the vendor library from __eglFini and __glXFini.
Created by: kbrenneman
Remove the remaining calls to the vendor library from __eglFini and __glXFini.
This removes the call to __glDispatchCheckMultithreaded from __eglFini, so that it doesn't risk calling a vendor library's threadAttach callback after the vendor library is unloaded. GLX had the same fix, but it never got applied to EGL.
I also removed the call to the vendor's releasePatch callback when libGLdispatch is unpatching the entrypoints from __eglFini or __glXFini.