[MacPorts] #67255: libsdl12 writes wrong pkgconfig settings in sdl.pc

[MacPorts]

#67255: libsdl12 writes wrong pkgconfig settings in sdl.pc
--------------------------+----------------------
 Reporter:  barracuda156  |      Owner:  jmroot
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:                |       Port:  libsdl12
--------------------------+----------------------
 `libsdl12` installs into `${prefix}/libexec/libsdl12` but has the
 following in `sdl.pc`:
 {{{
 # sdl pkg-config source file

 prefix=/opt/local
 exec_prefix=${prefix}
 libdir=${exec_prefix}/lib
 includedir=${prefix}/include
 }}}
 This can’t possibly work.

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Ticket URL: <https://trac.macports.org/ticket/67255>
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