New review comment by newbluemoon on void-packages repository

https://github.com/void-linux/void-packages/pull/32358#discussion_r749210769

Comment:
On my system synfig shows it’s messages according to my locale and the build log shows 
`-DLOCALEDIR=\"/usr/share/locale\"`.
 So exporting `DATADIRNAME` doesn’t seem to be necessary.

Edit:
While synfig’s `configure` just has `localedir="$datadir/locale"`
synfigstudio uses `LOCALEDIR=${prefix}/${DATADIRNAME}/locale` which breaks things.
So I think it’s good to go.