fix(tests): refine feature checks for SELinux

[xtqqczze]

Contributes to #11019

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/cut/bounded-memory (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/printf/printf-surprise is now being skipped but was previously passing.

[xtqqczze]

make / Build MSYS (windows-latest, feat_os_windows) (pull_request) failure tracked by .#12374

[cakebaker]

Thanks!