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

[Neil Schemenauer]

Neil Schemenauer <nas-python at arctrix.com> added the comment:

I didn't understand autoconfig well enough but I think I fixed it now.  Apparently MacOS is a platform where it has shm_open but you don't need to link with -lrt.  The revised 'configure' should handle that correctly now.

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