Makefiles
  - un-deprecate the port; bump PORTREVISION;
  - apply certain patches only if PYTHON_SUFFIX > 36;
  - use base system's ncurses instead of ports';

pkg-plist: use %%PYTHON_SUFFIX%%, instead of its value

files/*
  - extra*.py: https://docs.python.org/3/whatsnew/3.7.html
  - patch-tools_cibsecret.in: make proper use of `md5`