The useless iBCS2 supporting code is removed.

However, according to old_ syscalls, I would like to keep backward-
compatibility for a while, due to some old deb packages and 
executables for m32r.
I'm struggling to rebuild and replace old packages to new ones.
http://debian.linux-m32r.org/Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>