[MacPorts] #72379: whisper requires C11

[MacPorts]

#72379: whisper requires C11
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  Reporter:  barracuda156  |      Owner:  exprez135
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.5
Resolution:                |   Keywords:
      Port:  whisper       |
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Comment (by barracuda156):

 Replying to [comment:1 exprez135]:
 > Thank you for reporting. Does this stop the build entirely for you?
 >
 > If not, can you share the further results of the other tests `Looking
 for pthread_create in pthread` and `Looking for pthread_create in
 pthreads`?

 I recall pthread lib is reported as not found when the compilers fails to
 support the standard. And yeah, once CMake finds out that C11/C++11 is not
 supported, it fails on the spot.
 This is fixable by setting `compiler.c_standard 2011` in the portfile.

 Once done, configure failed on Metal not being present, and I did not
 investigate further. If Metal is required, then the port should be
 restricted to systems where this framework actually exists. If it is not
 required, then it should be disabled, conditionally on macOS version.

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Ticket URL: <https://trac.macports.org/ticket/72379#comment:3>
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