x11/alacritty: Unbreak tests
- Add x11-fonts/dejavu as a test dependency. This allows the "font" crate tests to find a font that matches "monospace".
- The test build cannot find libxcb. It is unclear why the link failure is not triggered during the normal build. Add USES=localbase for now.
error: linking with cc failed: exit code: 1
[...]
= note: /usr/bin/ld: error: unable to find library -lxcb
/usr/bin/ld: error: unable to find library -lxcb
/usr/bin/ld: error: unable to find library -lxcb
/usr/bin/ld: error: unable to find library -lxcb
/usr/bin/ld: error: unable to find library -lxcb-render
/usr/bin/ld: error: unable to find library -lxcb-shape
/usr/bin/ld: error: unable to find library -lxcb-xfixeserror: aborting due to previous error
error: could not compile copypasta.