Fix utime.c so it calls utime() on the right file and print valid errors.

Fix utime.c so it calls utime() on the right file and print valid errors.
Fix mkdirdeep.c so it is generally useful
 - don't dump/trace by default
 - exit on errors
 - allow deeper than 100 tree (up to PATH_MAX).
 - don't clobber stack generating stat pathnames.