hexchat: add head autoconf-archive build dep.
hexchat: add head autoconf-archive build dep.

Needed to build hexchat from source at current HEAD (post 10.12 release)

Closes #6.

Signed-off-by: Dominyk Tiller <53e438f55903875d07efdd98a8aaf887e7208dd3@gmail.com>

BrewTestBot/homebrew-gui