Log Message:
Update to 1.20

Upstrean changes:
1.20 2023-12-28 Todd Rinaldo <toddr@cpan.org>
    * #32 - Skip t/pty_get_winsize.t tests on AIX
    * #27 - Fix patchlevel check for util.h

1.19 2023-12-28 Todd Rinaldo <toddr@cpan.org>
    * #37 - Remove --no-undefined from compiler test which is not compatible \ 
with all platforms.