unix: expose mmap calls on z/OS

[MacMalainey]

The calls Mmap and Munmap were removed for z/OS.
Syscall removed occurred in: 508397

This change exposes them in a z/OS specific file
(to remove the accidental deletion of them in future refactors of the APIs for unix-like OSes).

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Patch Set 1:

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Patch Set 1:

(1 comment)

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Message from Mackenzie Malainey:

Patch Set 2:

(2 comments)

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Patch Set 2: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-03-07T19:30:14Z","revision":"669bddab1b87b8d7d502343621a2c64fb335e635"}

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Patch Set 2: -Commit-Queue

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This PR is being closed because golang.org/cl/569359 has been merged.