[MacPorts] #64827: Remove a ban of gcc10 in mpi Port group

[MacPorts]

#64827: Remove a ban of gcc10 in mpi Port group
--------------------------+--------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  base          |    Version:  2.7.2
 Keywords:  mpi           |       Port:  mpich
--------------------------+--------------------
 Do we need this in mpi Port group?

 {{{
         if {${os.major} < 12} {
                     lappend ::mpi.disabled_compilers -gcc9 -gcc10 -gcc11
                 } elseif {$is_mpich} {
                     # mpich: gcc11 subport currently disabled across-the-
 board
                     lappend ::mpi.disabled_compilers -gcc11
                 }
 }}}

 It took me quite a while to figure out why sundials that built nicely with
 gcc7 kept failing with gcc10. Turned out that it is banned here.
 Info is obsolete, gcc10 and mpich-gcc10 build on 10.5.8 and later.

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Ticket URL: <https://trac.macports.org/ticket/64827>
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