[Libguestfs] [PATCH] daemon: Fix type signature of mount_vfs (RHBZ#1564983).

[Richard W.M. Jones]

https://bugzilla.redhat.com/show_bug.cgi?id=1564983

Because Mount.mount_vfs was declared with the wrong type signature it
could never be called correctly from outside the daemon.

The root cause of this problem is that the generator doesn't generate
the type signatures automatically (which it could do, and fairly
easily).  Therefore there are probably other similar bugs waiting to
be found.

Rich.