This diff to stop using mquery has been in snaps for a few weeks, and I finally noticed some fallout. But it is amusing fallout: If you have a snap with the diff installed, you cannot build an install media in a shortcut way, since malloc.c in the real tree uses mquery, but the installed libc doesn't use mquery. So I need to build a -rHEAD real libc, first.
Anyways, I think the diff received enough testing to be commited.