Epoxy 1.5.4

Changes since 1.5.3

 - Don't build GLX tests if X11 support is disabled [Nirbheek Chauhan]
 - Add unit tests for epoxy_gl_version() [Eric Anholt]
 - Reduce the size of the binary by reusing static strings [Eric Anholt]
 - Fix build on Solaris [Alan Coopersmith]
 - Update the GL registries [Guchetan Singh]
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