[MacPorts] #61868: libusb @1.0.24: cannot parse USB.h with mainline gcc versions due to variant pragma handling not accepted by gcc

[MacPorts]

#61868: libusb @1.0.24: cannot parse USB.h with mainline gcc versions due to
variant pragma handling not accepted by gcc
-----------------------------------+-----------------------
  Reporter:  dgonyier              |      Owner:  michaelld
      Type:  defect                |     Status:  reopened
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.6.4
Resolution:                        |   Keywords:
      Port:  libusb, libusb-devel  |
-----------------------------------+-----------------------

Comment (by kencu):

 I'm actually surprised to hear it's not every os version. I wonder what
 they did in 10.15 and 11.x to allow gcc not to barf on USB.h there.

 We should probably copy what Apple did, if they did something to USB.h to
 fix this.

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Ticket URL: <https://trac.macports.org/ticket/61868#comment:23>
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