tests: Fix skipping mkdir-with-parents-permission test

Merged Philip Withnall requested to merge pwithnall/glib:root-test-fix into master

If the user has CAP_DAC_OVERRIDE or similar (for example, if running the tests as root), the mkdir-with-parents-permission test is skipped.

The check for CAP_DAC_OVERRIDE was by creating a subdirectory of the test directory. That subdirectory, however, was never removed, which caused a ‘directory not empty’ error when trying to delete the test directory.

Fix that by correctly deleting the subdirectory if skipping the test.

Signed-off-by: Philip Withnall withnall@endlessm.com

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