[MacPorts] #55499: mingw-w64: missing secure api support

[MacPorts]

#55499: mingw-w64: missing secure api support
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  Reporter:  bruvzg       |      Owner:  mojca
      Type:  enhancement  |     Status:  reopened
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  mingw-w64    |
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Comment (by mojca):

 Quote from [https://chromiumcodereview.appspot.com/12189010/ chromium]:
 > ''Windows XP does not provide secure API functions in `msvcrt.dll` but
 > newer versions of Windows do. Avoid using secure API functions for
 > compatibility with `msvcrt.dll` on Windows XP.''

 I guess XP is not too relevant, but it would be nice to update
 [https://github.com/mirror/mingw-w64/tree/master/mingw-w64-doc/howto-build
 the build docs] and at least mention a few words about what those flags do
 and why users might want to enable them by default.

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Ticket URL: <https://trac.macports.org/ticket/55499#comment:9>
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