$VERSION bump cpan/ExtUtils-MakeMaker/lib/ExtUtils/Liblist/Kid.pm

Picked up by .\perl Porting\cmpVERSION.pl -d --tag v5.21.3 but not by
.\perl Porting\cmpVERSION.pl -d -x --tag v5.21.3 or porting/cmp_version.t.