[MacPorts] #54236: port:mesa & port:libepoxy : provide and support EGL

[MacPorts]

#54236: port:mesa & port:libepoxy : provide and support EGL
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 Reporter:  RJVB         |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  mesa libepoxy
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 A couple of patches to enable the building of (support for) EGL in
 port:mesa and port:libepoxy .

 Not actually tested yet, but libEGL builds with only a source-level patch
 to replace some clock_gettime() functionality with (close) equivalents.
 Which may not even be required on 10.12 and up .

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Ticket URL: <https://trac.macports.org/ticket/54236>
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