package/libsemanage: drop !BR2_arc dependency

package/libsemanage: drop !BR2_arc dependency

Now that libselinux is available on ARC, we can drop the !BR2_arc
dependency from libsemanage.

Note that in practice, libsemanage is still not available on ARC,
because BR2_PACKAGE_AUDIT_ARCH_SUPPORTS does not include the ARC
architecture. But still, it makes sense to drop that !BR2_arc which
was inherited from libselinux.

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