Unnecessary dependency on Perl

[me-and]

Per @svnpenn's comment at #26, can we also remove the base requirement on Perl? Need to investigate what actually requires it first.

[me-and]

https://cygwin.com/ml/cygwin/2017-07/msg00228.html:

Currently only these files rely on it:

• usr/libexec/git-core/git-add--interactive
• usr/libexec/git-core/git-archimport

[me-and]

Closing per https://cygwin.com/ml/cygwin/2017-07/msg00288.html

Specifically, while git add --interactive and friends depend on Perl, splitting them off into a separate package is going to cause too much confusion. If and when those commands no longer depend on Perl, we can look at resurrecting this ticket.

[ghost]

I am putting this here so I can check periodically if they have ported to C - thanks

http://github.com/git/git/blob/master/git-add--interactive.perl