[Patch libobjc] Fix Darwin32 PPC struct size foo.

[Dominique Dhumieres]

I have posted at http://gcc.gnu.org/ml/gcc-testresults/2010-12/msg01004.html
the results with this patch applied. It works as advertised!

The only remaining failure on both ppc/intel is

FAIL: objc.dg/exceptions-2.m -fnext-runtime (test for excess errors)

with -m64. There also some XPASS

objc.dg-struct-layout-encoding-1/t026_main.m on both ppc/intel and -m32/64,

XPASS: objc.dg-struct-layout-encoding-1/t030_main.m execution test
XPASS: objc.dg-struct-layout-encoding-1/t031_main.m execution test
on ppc both -m32/64 and

XPASS: objc.dg-struct-layout-encoding-1/t025_main.m execution test
XPASS: objc.dg-struct-layout-encoding-1/t027_main.m execution test
XPASS: objc.dg-struct-layout-encoding-1/t028_main.m execution test
XPASS: objc.dg-struct-layout-encoding-1/t029_main.m execution test

on ppc -m64.

Thanks,

Dominique