Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
Move to generating pccarddevs.h on the fly, both for the kernel andthe modules.Also generate usbdevs.h automatically now, but a non-kernel file isstopping that at the moment.
Add module infrastructure for 'if_ex'.