Log Message:
Fix pr pkg/29168.

Update sylpheed-claws to 1.0.1.  Taking the patch to use autoconf to regen
the configure script, rather than having to keep patch-ab uptodate.

Also remove PKGREVSION from plugins, they should be able to just ride the
main sylpheed-claws updates.

I also suspect that pgpmime should be converted to a plugin, rather than
being part of the main sylpheed package.  (it would remove a dependancy on
gpgme)  However it seems to install header files, which would complicate
making it a plugin package.

Also fix pkglint warning about MESSAGE.plugins, the = line was only 74,
not 75 chars in length.