Stubs and parsing for rename and timestamps (XCC)

Glibc calls for utime, utimes, futimens, and whatever all call wstat
underneath.  The kernel just prints out the request and fails.

Any of the "at" calls will error out if you give them a directory fd.
We'll eventually support those.

We don't support the symlink flags for utimensat either.  Those are just
ignored, since wstat doesn't follow links (at least not explicitly, and
it might for the VFS).  Will probably need to handle that for all wstat
too (either a flag or lwstat).  Can address that when we sort out the
"at".