[MacPorts] #37177: Fix mesa installed headers

[MacPorts]

#37177: Fix mesa installed headers
-------------------------+----------------------
 Reporter:  michaelld@…  |      Owner:  jeremyhu
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.2
 Keywords:               |       Port:  mesa
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 Mesa installs the header ${prefix}/include/VG/vgplatform.h, which
 internally #include's <>. This header is found in, but not installed by,
 Mesa, and required when checking to see if OpenVG works. I'm attaching a
 simple patch that changes the Mesa install to include this header.

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Ticket URL: <https://trac.macports.org/ticket/37177>
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