[Patch, testsuite]: use gnu-runtime on 64-bit Darwin8

[Mike Stump]

On Oct 4, 2006, at 10:04 AM, Andrew Pinski wrote:
> fix up the runtime to create libobjc istead of libobjc-gnu for 64bit.

No, this part is wrong.  There is other magic already in place that  
handles this transparently for the user:

config/darwin.h:
    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\

This just needs something like:

   ${m64:%:version-compare(< 10.5 mmacosx-version-min= %{!fnext- 
runtime:%:replace-outfile(-lobjc -lobjc-gnu)})}

to get the -lobjc translated for OSes < 10.5 when -m64 is given, in  
addition to the flag logic.