Up until and including 14.0.0, the OpenMoji font only works in Icecat.
However, the git sources already include variants that work in other browsers
and desktop applications, so let's use them.
* gnu/packages/fonts.scm (font-openmoji): Update to 14.0.0-1.93f059d.
[source]: Change to git-fetch.
[arguments]: Add ‘chdir’, ‘strip-alternative-variants’ and ‘chdir-back’.