readme: mark libseat as mandatory dep
[1] has made wlroots unconditionally depend on libseat. Mention this
in the README.
[1]:
@@ -50,7 +50,7 @@ Install dependencies:
* xkbcommon
* udev
* pixman
-* libseat (optional, for (e)logind and seatd support)
+* [libseat]
If you choose to enable X11 support:
@@ -81,4 +81,5 @@ See [CONTRIBUTING.md].
[wiki]: https://github.com/swaywm/wlroots/wiki/Getting-started
[Sway]: https://github.com/swaywm/sway
[wrapper libraries]: https://github.com/search?q=topic%3Abindings+org%3Aswaywm&type=Repositories
+[libseat]: https://git.sr.ht/~kennylevinsen/seatd
[CONTRIBUTING.md]: https://github.com/swaywm/wlroots/blob/master/CONTRIBUTING.md
