build: exclude chcon and runcon from util_map for non-Linux targets

[xtqqczze]

Contributes to #11019

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/misc/tty-eof. tests/misc/tty-eof is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/tail/symlink (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/cut/bounded-memory (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tail/tail-n0f (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/dd/no-allocate is now being skipped but was previously passing.
Note: The gnu test tests/expand/bounded-memory is now being skipped but was previously passing.

[xtqqczze]

• GnuTests / Aggregate GNU test results (pull_request) failure tracked by GNU: tests/misc/tty-eof intermittent failure #12376

[xtqqczze]

• OpenBSD / Tests (unix) (pull_request) failure tracked by ci: OpenBSD / Tests (unix) intermittent failure #12377.

[cakebaker]

Thanks!