unix: add f_flag member flags on z/OS

[jlee3227]

This change adds the constants ST_RDONLY and ST_NOSUID to a z/OS-specific file.

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Patch Set 1:

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

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This PR is being closed because golang.org/cl/606877 has been merged.