Libobjc and libffi on Darwin

[Bill Northcott]

I built gcc-3.5 on MacOS X using source from the cvs with tag 
apple-ppc-gcc-1771 (merged from lno 20040718) and the patches which 
Andrew has proposed to enable libobjc.  This seems to work fine so far. 
  I managed to compile a working set of Swarm libraries with it, 
although I am not yet using the GNU runtime.

I tried to enable libffi by moving it from the gcj only section in the 
configure script.  It all got built OK using Apple's build script but 
ffi.h never got installed.  ffitarget.h was installed in the compiler 
includes directory.  Any suggestions where this should be fixed?

Bill Northcott