[MacPorts] #68941: fix cxx_stdlib of mpich with gcc version higher than 10

[MacPorts]

#68941: fix cxx_stdlib of mpich with gcc version higher than 10
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 Reporter:  numaryu      |      Owner:  (none)
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  mpich-gcc10, mpich-gcc11, mpich-
                         |  gcc12, mpich-gcc13
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 According to compilers-1.0.tcl, cxx_stdlib should be libc++ for gcc
 version higher than 10.

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Ticket URL: <https://trac.macports.org/ticket/68941>
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