at the moment) are pulled out into tc.mi and tc.old files.
tc.mi has any files which are in the new toolchain only and tc.old contains
the reverse (files which only existed in the old toolchain). The remainder
of the toolchain that is common between both old and new is still contained
in the various mi/md files.
Check for USE_NEW_TOOLCHAIN=yes in makeflist to determine which tc files to
pull in if they exist.
XXX - All the toolchain bits should eventually be pulled out into separate
lists as tc.mi and tc.<arch>. Leaving it for now until the new toolchain is
fully integrated on all ports.