[MacPorts] #47553: compilers portgroup: add option for gcc5

[MacPorts]

#47553: compilers portgroup: add option for gcc5
---------------------------+--------------------
  Reporter:  ryandesign@…  |      Owner:  sean@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  compilers     |
---------------------------+--------------------

Comment (by sean@…):

 Replying to [comment:7 ryandesign@…]:
 > Can't there be just a single block that deals with all versions of gcc?

 I assume because the logic of converting '49' -> '4.9' is annoying :-)
 I've made it one block and will push after running some tests.

-- 
Ticket URL: <https://trac.macports.org/ticket/47553#comment:9>
MacPorts <https://www.macports.org/>
Ports system for OS X