same as with sys/xattr, these touch files, so should use a tmpdir
provided by cargo, which requires them being integration tests.
if the tmpdir doesn't support O_TMPFILE (like overlayfs), the test is
not run (unfortunately, there is no way to indicate this via the test
result like with other test frameworks).
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
