Update to support Emacs 21.
PR: 33094
Submitted by: yoichi
Add a patch to mitigate slow Mule-UCS loading in Emacs 21.2,
written by Dave Love <d.love@dl.ac.uk>.
Obtained from: http://tsukuba.m17n.org/mule-archive/2002-3/msg00000.html
Use ${DOCSDIR} instead of ${PREFIX}/${PORTDOCDIR}.