Epoxy 1.5.6

Changes since 1.5.5
-------------------

 - Fix issue with loading OpenGL/GLX/EGL libraries [#238, Yaroslav
   Isakov]
 - Expose dependency variables in pkg-config file [#231, Xavier
   Claessens]
 - Support Win64 pointer-sized types [#246]
 - Close output objects when generating files [#242, Aleksandr]
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