[MacPorts] #59235: MacVim fails to build on macOS 10.15 Catalina

[MacPorts]

#59235: MacVim fails to build on macOS 10.15 Catalina
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  Reporter:  moyang  |      Owner:  raimue
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.1
Resolution:          |   Keywords:
      Port:  MacVim  |
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Comment (by majoc-at-astro):

 Replying to [comment:10 nblievers]:
 > The first issue is fixed by adding
 > {{{ use_xcode yes }}}
 > to the Portfile.

 For completeness, I've found that necessary for our builds for 10.14 and
 10.13 as well, though possibly for different reasons.  Let me know if
 you'd like to see the logfiles, please.

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Ticket URL: <https://trac.macports.org/ticket/59235#comment:18>
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