wflinfo: use glGetStringi() only when available
Here are two different patches either one fixing a crash with the following:
export LIBGL_ALWAYS_SOFTWARE=1 wflinfo --platform glx --api gl --profile compat --version 3.1
The latter patch is a cool idea, especially since it addresses the problem on most platforms. Namely glx, cgl and in some EGL cases. I'm inclined to merge it as well, barring any objections.
Ben any preference on the latter patch?