Revert "spelling: distclean"
"distclean" is a *different* kind of target than "destclean"
"destclean" presumably means "uninstall from the destination".
"distclean" means, by convention, "clean the source into the way that
you would like before creating a tarball for distribution"
This switch introduced some ugliness for debian packaging, as can be
seen in
https://salsa.debian.org/dns-team/ldns/-/commit/
8b84b73590ac4321e1bf0982d60a7e94b037d6e5
This reverts commit
298b2a65920944aee833d4392e3651f25421c759.