[MacPorts] #38018: Doxygen: Prevent clang memory leak by adding back the flag reinplaced away by r101062

[MacPorts]

#38018: Doxygen: Prevent clang memory leak by adding back the flag reinplaced away
by r101062
---------------------+--------------------------------
 Reporter:  egall@…  |      Owner:  macports-tickets@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.1.3
 Keywords:           |       Port:  doxygen
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 Removing `-Wno-invalid-source-encoding` causes `clang++` to memory leak
 when it hits certain files used when compiling `doxygen`, which makes it
 take forever, to the point where I usually just end up ^C-ing it. I can
 see why removing this flag might be necessary for `gcc`, but couldn't this
 reinplace at least be done conditionally? i.e. do the reinplace iff
 `configure.compiler == gcc`; on the other hand, if `configure.compiler ==
 clang`, then don't do it.

 (r101062 for reference)

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Ticket URL: <https://trac.macports.org/ticket/38018>
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