remove mfs

mfs has been made completely obsolete by tmpfs. remove it.

with input from and ok natano@
reformat clang entry
Allow mknod(2) in chroot, when kern.chroot_mknod=1.

From Daniel Dieckmann <dieck at pestilenz.org> at PhantomBSD.

ok pedro@ drahn@
Fix arm compile issues caused by sync

ok drahn@
Implement a fix for 5.6-stable:

fix for the SSL session reuse vulnerability (CVE-2014-3616)
ok jasper@

"sure, go ahead" natano@
sync
create checksum for game set.

ok natano@
Remove unused CRUNCHCONFS variable.

ok pedro@
Remove elfrdsetroot (rd(4) has been removed).

ok pedro@