Cross compile for g77 and objc

[H.J. Lu]

I saw cross compile disabled for g77 and objc. I enabled it by hand.
It seems to work for me from glibc 2 to libc 5 on x86. I also tried
from glibc 2/x86 to glibc 2/ppc.

-- 
H.J. Lu (hjl@gnu.org)