Retire the unimplemented MAP_RENAME and MAP_NORESERVE flags to mmap(2).
Older binaries are still permitted to use these flags.

PR:		193961 (exp-run in ports)
Differential Revision:	https://reviews.freebsd.org/D848
Reviewed by:	kib


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273250 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f