ok_manifest reports duplicate files on internal symlinks

[andk]

Witness the following sequence of commands in a shell starting in an empty directory. ok_manifest complains about A.txt appearing more than once. The bug is to count the target of the symlink.

% mkdir somedir
% date > somedir/A.txt
% ln -s A.txt somedir/B.txt
% perl -e 'use ExtUtils::Manifest; ExtUtils::Manifest::mkmanifest'
Added to MANIFEST: MANIFEST
Added to MANIFEST: somedir/A.txt
Added to MANIFEST: somedir/B.txt
% perl -e 'use Test::CheckManifest; ok_manifest();'
1..1
not ok 1
#   Failed test at -e line 1.
#          got: 0
#     expected: 1
# The following files appeared more than once in the MANIFEST file: /home/andk/work/bugreport-Test-CheckManifest/somedir/A.txt
# Looks like you failed 1 test of 1.

Enjoy&&Regards,