```
graphics/zathura: Update to 0.4.8, Add SyncTeX support
The port depended on libsynctex without ever using it, as it
was never passed to the meson build, and even if it was, it
would fail since it requires libsynctex >= 1.19.0 and the
current version is 1.17.0.
It now works as expected once D32264 lands.
pkg-descr and pkg-message are also improved.
```