Epoxy 1.5.1

Changes since 1.5.0:

 - Do no add pkg-config dependencies on gl on systems that do not use
   pkg-config, like macOS and Windows [Tom Schoonjans, #156]
 - Generalise checks for dlvsym [Ross Burton, #158]
 - Add an option for disabling building the test suite [Ross Burton]
 - Typo fixes in the comments and documentation [luz.paz, #159]
 - Simplify the Meson configuration logic for EGL and GLX [Eric
   Engestrom, #162]
 - Use assert when no context is found [Adam Jackson, #166]
 - Remove a test superceded by GLVND [#165]
 - Avoid Meson warnings when testing for linker arguments
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