bug#61195: termite failed to build, need switch to a maintained fork

[宋文武 via Bug reports for GNU Guix]

> New fork: https://github.com/aperezdc/termite
> Maybe also remove vte-ng.

Done in commit 1b8c5480f64a57f46e39822136d279fa0b1270cd and
34b56974dfe720e5e30f04409ac216747d7e3f5c.