[issue35903] Build of posixshmem.c should probe for required OS functions

[Davin Potts]

Davin Potts <python at discontinuity.net> added the comment:

Agreed that the logic for building that code needs exactly this sort of change.  Thanks for the patch!

It looks like your patch does not happily detect the dependencies on MacOS for some reason, but all appears well on Windows & Linux.  I will have a closer look in the morning on a MacOS system.

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