[patch, darwin] repost of a patch to make "-static-libgfortan" work.

[IainS <developer at sandoe-acoustics dot co dot uk>]

ref: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31400

Here is an updated repost of a patch I made back in the summer,   
hopefully, this could be considered for 4.5

Darwin's linker doesn't support Bstatic/Bdynamic and defaults to the  
shared version when shared and static libraries have the same basename.
Even if this is fixed sometime on darwin9 or later - it seems  
improbable that such a fix would be extended to darwin8.

changes:
	gcc/config/x-darwin:  add a flag signalling that this host needs  
distinct static library names.
	gcc/fortran/gfortranspec.c: use a distinctly named libgfortran.a if  
the host requires it for "-static-libgfortran"

	libgfortran/Makefile.am : make separately named libgfortran-static.a  
if the host is darwin, don't generate libgfortran.a
	libgfortran/configure.ac: provide a flag on darwin systems that  
require a separately named static library

	libgfortran/Makefile.in regenerated
	libgfortran/configure regenerated

regtested -m32/-m64 on i686-apple-darwin9
regtested -m32/-m64 on powerpc-apple-darwin8

(note, that to use this -m64 on darwin8, GCC must be built with  
dwarf-2 as the default debug format - because ld64 doesn't like stabs  
-- this is a general case, not related specifically to static  
libgfortran).

Thanks to Ralf Wildenhues for help with the auto* changes.

cheers,
Iain

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