user/unbound: Bump to 1.9.1



See merge request !203

user/php7: bump to 7.2.16, modernize, build with enchant-2

* Drop CVE-2018-19935.patch: included as of version 7.2.14

See merge request !204

* Drop CVE-2018-19935.patch: included as of version 7.2.14

zlg's package bumps for March 2019

This is a routine package upgrade. There is one thing to note, however:

* `py3-pyyaml` has a minor issue building due to a missing `ext/_yaml.c` file. It 
  appears that a tool is used to generate the `.c` file it needs to compile the 
  module. It falls back to pure-Python mode and passes all tests, however.

I hand-tested `py3-pyyaml` by using vgstash to export a game collection to yaml (everything worked fine) and received a test cert from 
`certbot` to confirm the bumps didn't break anything affected on my system, since they're the two largest consumers of what was bumped.

This should be the last version bump from me until post-1.0-BETA3, barring security bumps.

See merge request !202

user/chrony: Use libedit

Thanks-to: Samuel Holland <samuel@sholland.org>

See merge request !201

Based on https://github.com/manisandro/gtkspell/commit/c29e0bd6bf432b7c990ab8ddcf79fd708d5c9fc3