[MacPorts] #44995: gcc410: rename to gcc5

[MacPorts]

#44995: gcc410: rename to gcc5
--------------------------+-------------------------
 Reporter:  ryandesign@…  |      Owner:  mww@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  gcc410 gcc5
--------------------------+-------------------------
 Following the [https://gcc.gnu.org/develop.html#num_scheme new gcc version
 numbering announcement], the gcc410 port will need to be renamed gcc5 to
 continue with updates. A stub gcc410 port should be left for one year
 marked as `replaced_by gcc5` to help existing users of gcc410 upgrade
 cleanly.

 I created the initial gcc410 port (from your gcc49 port), and if you like
 I can work on this renaming situation as well.

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Ticket URL: <https://trac.macports.org/ticket/44995>
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