Add epoxy_has_glx()

Libraries and applications that depend on Epoxy currently have no way to
safely degrade functionality if they are used on a platform without GLX
support; the only way to achieve that is to perform a symbol check
themselves, by essentially copying what Epoxy already does.

By exposing `epoxy_has_glx()`, those libraries and applications now have
the chance of querying Epoxy itself and gracefully handle failure.

0 files changed, 0 insertions, 0 deletions