package/selinux-python: now available on !glibc configs

package/selinux-python: now available on !glibc configs

The BR2_PACKAGE_SELINUX_PYTHON_AUDIT2ALLOW was not available on !glibc
due to its dependency on checkpolicy. Now that checkpolicy is
available on !glibc systems, we can drop that dependency.

Note that the Config.in comment was wrong: it did mention the glibc
dependency, but the corresponding "depends on" was not there.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>