Make Emacs perl-mode indent more like perltidy.
This especially helps braces that surround code blocks. Back-patch to
v11, where commit
56fb890ace8ac0ca955ae0803c580c2074f876f6 first
appeared; before that, settings were even more distant from perltidy.
Reviewed by Andrew Dunstan.
Discussion: https://postgr.es/m/
20190103055355.GB267595@gust.leadboat.com