Fix a typo.

Sponsored by:	The FreeBSD Foundation
Reorganize this Makefile so that all the bsd.*.mk bits are in one
section at the bottom.

Reviewed by:	imp
When usermode loaded non-default segment selector into the %gs,
correctly prepare KGSBASE msr to restore the user descriptor base on
the last swapgs during return to usermode.

Reported and tested by:	peterj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Add missing , in converted font output

Submitted by:	Claude Buisson
Add support for the unmapped i/o to mfi(4).

Tested by:	Nicholas Esborn <nick@desert.net>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week