MFC r237339:

MFC r237339:

Polish previous revision: if the fts_* routines have lstat()'ed the
directory entry then use the struct stat from that instead of doing
it again, and skip the rm_overwrite() call if fts_read() indicated
that the entry couldn't be a regular file.

Obtained from:	OpenBSD

MFC r237284 (kevlo):

Fix potential symlink race condition in "rm -P" by adding a check
that the file we have opened is the one we expected.  Also open in
non-blocking mode to avoid a potential hang with FIFOs.

Obtained from:	NetBSD via OpenBSD

git-svn-id: svn://svn.freebsd.org/base/stable/9@237615 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f