Bugzilla Bug 61884

(1) update kernel.eclass's set_arch_to_kernel to handle mips

(2) in src_compile(), instead of screwing around with $ARCh, first call set_arch_to_kernel at the beginning and then call set_arch_to_portage at the end

(3) make defconfig's should be run like this:
make defconfig HOSTCFLAGS="-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -I${S}/include/" otherwise some files fail to be generated if /usr/include/{linux,asm} is empty (user cleaned all kernel headers or something)

(4) after running the defconfig target, `make prepare` should be run (passing the same $HOSTCFLAGS as above) ... this is a new target for 2.6 and generates a bunch of required files/symlinks ... depends on the $ARCH as to what exactly gets 'prepared'

and here's one list thing to be imported from the linux26-headers package:

from src_compile():
    # autoconf.h isnt generated unless it already exists. plus, we have
    # no gurentee that any headers are installed on the system...
    [ -f ${ROOT}/usr/include/linux/autoconf.h ] || \
        touch ${S}/include/linux/autoconf.h

All fixed up (for now)