Change some URLs from author dirs to dist dirs.
The example in the porter's handbook didn't have the trailing slash;
mea culpa for not having caught that when it went in.
implementation of MD4 (like `Digest::Perl::MD5'). Because of this, it is
slow but avoids platform specific complications. For efficiency you
should use `Digest::MD4' instead of this module if it is available.
WWW: http://search.cpan.org/dist/Digest-Perl-MD4
PR: ports/90771
Submitted by: Gabor Kovesdan
