Epoxy 1.5.5

Changes since 1.5.4
-------------------

 - Remove Python 2 support [#213]
 - Remove Autotools support [#212]
 - Use `EGL_NO_X11` to disable X11 headers [#216]
 - Use call convention for mock function [crziter, #220]
 - Return correct version of GLSL on GLES2 [Eric Anholt, #223]
 - Rely on Meson's darwin_versions option [#225]
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