libgfortran build broken on Darwin ppc

[Jack Howarth]

Eric,
   You definitely want the autoconf patch added
in otherwise builds of libgfortran will crash
when older cctools are used (like Xcode 2.3).
I'll try a build of current gcc trunk with 
your new darwin.c correction but without
the autoconf patch to see if all the literal16
support exists in Xcode 2.4 or if we need
a even newer cctools for that.
                  Jack