[MacPorts] #47828: libepoxy: wrong hardcoded libGL location

[MacPorts]

#47828: libepoxy: wrong hardcoded libGL location
--------------------------+----------------------
 Reporter:  ryandesign@…  |      Owner:  devans@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.99
 Keywords:  haspatch      |       Port:  libepoxy
--------------------------+----------------------
 MyPaint-devel fails to open. The message is:

 {{{
 Couldn't open /opt/X11/lib/libGL.1.dylib:
 dlopen(/opt/X11/lib/libGL.1.dylib, 5): image not found
 }}}

 /opt/X11 is not mentioned in the MyPaint source code. I could only find it
 mentioned in libepoxy. The attached patch fixed the problem for me.

 If you have Xquartz installed in /opt/X11 you wouldn't have noticed this
 problem, but I don't so I did.

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Ticket URL: <https://trac.macports.org/ticket/47828>
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