[arch-dev-public] new mount in testing

Hi guys, With util-linux-2.21 we have switched to a new implementation of mount, based on the libmount library. We have tested this in the release candidates for some weeks, and it seems good to go. However, I intend to keep util-linux in testing longer than normal just in case. Please keep an eye out for oddities, especially if you are using mount in any non-standard ways that we might not have tested. Cheers, Tom