New review comment by abenson on void-packages repository

https://github.com/void-linux/void-packages/pull/33066#discussion_r714467407

Comment:
`_pppver` is never defined.

Also, you can probably drop all of this and replace it with

    configure_args="--libexecdir=/usr/lib/networkmanager --with-pppd-plugin-dir=/usr/lib/pppd/$_pppver"