Fix circular dependency created after r287197 between ldconfig and mountcritremote

ldconfig is already required by mountcritremote indirectly, as noted by rcorder:

rcorder: Circular dependency on provision mountcritremote' in file ldconfig'.

Having mountcritremote REQUIRE ldconfig breaks dependency ordering.

Making the ldconfig hints be conditionally regenerated from mountcritremote when
remote filesystems are mounted is done after this change, similar to cleanvar
being conditionally called after the change.

Differential Revision: https://reviews.freebsd.org/D6621
PR: 202726
Reviewed by: jilles
Sponsored by: EMC / Isilon Storage Division