libutil: Add missing MLINKs

MFC after: 1 week
Reviewed by: olce, imp, emaste
Differential Revision: https://reviews.freebsd.org/D51706

(cherry picked from commit 22afc767869a23f4e0ec5436ce843728fded950c)

libutil: Remove manual link for nonexistent function

I believe quota_statfs() was the original name of the function now
called quota_check_path(). I must have forgotten to update the MLINK
when I renamed it.

MFC after: 1 week
Fixes: 5666aadb3ddf ("Further extend the quotafile API.")
Fixes: 22afc767869a ("libutil: Add missing MLINKs")
Reviewed by: bcr
Differential Revision: https://reviews.freebsd.org/D51863

(cherry picked from commit 7400d04407c033341ddc0b323b5ae7cd1cca358f)

libutil: Fix manlint failures

MFC after: 1 week
Reviewed by: ziaee
Differential Revision: https://reviews.freebsd.org/D51864

(cherry picked from commit d0cc09fcdb4a3192fb76c95b1bd3c7f31a4cf486)

ObsoleteFiles: Remove bogus manlink

Fixes: 7400d04407c0 ("libutil: Remove manual link for nonexistent function")
(cherry picked from commit 46f9056367596daad0b4f0065e5a8fa0bcbb907d)