Clean up detection of hard-float ABIs. As with big-endian in r272368 we
can check against arm*hf*.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272369 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Embellish a comment regarding the reliability of DEBUG_VFS_LOCKS.

Submitted by:	kib


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272371 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f