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

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

@Neil: On what version of macOS did you test? 

On 10.14.3 with Xcode 10.1 shm_open is in libSystem (that's named libc on most other unixy systems) and there is no library named librt.

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nosy: +ronaldoussoren

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