Man the lifeboats! Tie down the hatches! Red alert! Activate gcc-2.7.2.1!

Man the lifeboats!  Tie down the hatches!  Red alert! Activate gcc-2.7.2.1!

(the old cc has been tagged with "gcc_2_6_3_final" so we have a reference
 point in case of unforseen disasters...)

This has the objc backend active, and I think I've managed to get the
f77 f2c support through in one piece, but I don't know fortran to test it.

A 'make world' change and libobjc commit will follow.

If you normally do 'make -DNOCLEAN world', do not do so this time, I know
it can fail with groff.

This version of gcc makes a **LOT** more warnings on our kernel.