Fix handling of keys in executable maps.  Previously it was broken for keys
containing whitespace.

PR:		192947
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation


git-svn-id: svn+ssh://svn.freebsd.org/base/head@270454 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f