Update audio/praat to latest upstream release
We skipped 6.1.{36,37,38,39} and now land at 6.1.40; the release
notes (for all versions) are at
https://www.fon.hum.uva.nl/praat/manual/What_s_new_.html
and can be summarized as
- handful of fixes probably not relevant to us
- scripting extensions
The FreeBSD makefile with settings and things has been merged
upstream, so we can lose that file from ports and simplify
post-patch ever-so-slightly.