Epoxy 1.5.2

Changes since 1.5.1:

 - Fix the detection of the -z,relro linker flag
 - Query the EGL context version when bootstrapping on GLES [Adam Jackson]
 - Avoid inadvertedly loading libraries when probing for them [Adam Jackson]
 - Issue #169: Fix build on FreeBSD [Ting-Wei Lan]
 - Consistently use abort() instead of exit() for internal state checks
 - Issue #171: Fix a performance regression in the global function pointer
   trampolines introduced by using -Bsymbolic-functions
 - Improve performance when using GL function pointers like glAlphaFunc [Adam Jackson]
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