If a freebsd-update patch touches a kmod that isn't in GENERIC, then the
kernel version according to freebsd-version will not be bumped. This
results in a little bit of a dilemma for users, as it's not clear that
the userland version being higher than the necessary patchlevel is
sufficient to be confident that the kmod is patched.
Start embedding version information into kmod builds like we do the
kernel, so that recommendations like what(1) can be used to resolve
these sorts of concerns. We might find a better solution in the future
and this will be somewhat OBE with pkgbase, but this seems like a
reasonable solution for stable/13 and stable/14 until EoL.