mips build from HEAD

[Jerry Toung]

I patched files.mips and options.mips, now make buildkernel complains about
opt_cputype.h missing.
If I comment out that include file, locore.S fails with several opcode
unresolved.

-I/usr/home/jtoung/MIPS/src/sys/gnu/fs/xfs -D_KERNEL
-DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-common
-finline-limit=15000 --param inline-unit-growth=100 --param
large-function-growth=1000  -EL -fno-pic -mno-abicalls -G0 -march=mips32
-msoft-float -mno-dsp -ffreestanding
/usr/home/jtoung/MIPS/src/sys/mips/mips/exception.S:57:25: error:
opt_cputype.h: No such file or directory
/usr/home/jtoung/MIPS/src/sys/mips/mips/swtch.S:58:25: error: opt_cputype.h:
No such file or directory
/usr/home/jtoung/MIPS/src/sys/mips/mips/tlb.S:58:25: error: opt_cputype.h:
No such file or directory
mkdep: compile failed
*** Error code 1

Stop in /usr/obj/mips/usr/home/jtoung/MIPS/src/sys/MALTA.
*** Error code 1

Stop in /usr/home/jtoung/MIPS/src.
*** Error code 1

Stop in /usr/home/jtoung/MIPS/src.