Certain X server do not have GLX enabled or supported, such as x2go. We
can handle this case gracefully inside libepoxy.
Signed-off-by: Emmanuele Bassi <ebassi@gnome.org>
Most of the changes that happened after commit 8bbc0d40 broke epoxy
pretty much irreparably because of the CMake build and the attempt at
making libepoxy a static library that can be copy-pasted into another
project without generating files.
Since all the commits are entangled, and are full of unrelated changes,
we cannot simply do a localized set of reverts; instead, we need to hit
the reset button.
From this point forward, we're going to improve libepoxy's build while
attempting to keep the existing build system working. This may mean
reinstating the CMake build system at a later date.
The dlopen bits are left in place, but the functions required the
types, and in the case of EGL, the types require that the platform
header actually exists.
Emmanuele Bassi
Yaron Cohen-Tal
Eric Anholt