[makepkg] feature: support for sccache
While makepkg can already use ccache (https://wiki.archlinux.org/title/Makepkg), it seems using sccache (https://github.com/mozilla/sccache) is not yet possible though.
This was also asked about in the forums (https://bbs.archlinux.org/viewtopic.php?pid=2038035#p2038035) a while back.
Since sscache seems to receive more attention lately (maybe due to it supporting Rust?), would be nice if Makepkg also supported it.