-*-*-darwin ranlib option change

[Andrew Pinski]

Geoff,
   Your change to configure.in and configure broke installing gcc on powerpc-apple-darwin6.3 because in gcc/Makefile.in there is check for if RANLIB_FOR_TARGET exists.

Makefile.in portion, line 236 on:
RANLIB_TEST_FOR_TARGET = \
  [ -f $(RANLIB_FOR_TARGET) ] \  
  || ( [ "$(host_canonical)" = "$(target)" ] \
       && [ -f /usr/bin/ranlib -o -f /bin/ranlib ] )


Thanks,
Andrew Pinski
pinskia@physics.uc.edu
apinski@apple.com