shm: allow for older versions of Linux without MFD_NOEXEC_SEAL
Follow-up on !792 (merged) to support running pulseaudio on older versions of linux that don’t have MFD_NOEXEC_SEAL instead of failing the MEMFD
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Follow-up on !792 (merged) to support running pulseaudio on older versions of linux that don’t have MFD_NOEXEC_SEAL instead of failing the MEMFD