Log Message:
Removing shells/mudsh. From FreeBSD PR:
   https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=104260
  ---------------------------
  The MASTER_SITES for shells/mudsh is invalid.  The email
  address of the submitter of the port is no longer valid.
  The app itself is a single perl script with no author in it.
  ---------------------------
Thanks wiz@ for review.