[MacPorts] #40174: upgrade mingw and add win64 cross-compiler

[MacPorts]

#40174: upgrade mingw and add win64 cross-compiler
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 Reporter:  sam.halliday@…  |      Owner:  macports-tickets@…
     Type:  update          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.2.0
 Keywords:                  |       Port:
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 the MingW cross-compiler for windows is quite old and there is currently
 no cross-compiler for Windows 64. Packages for both would be fantastic!

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Ticket URL: <https://trac.macports.org/ticket/40174>
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