* config-ml.in: On mips*-*-*, if multidirs contains mabi=64, try to

        link a trivial program with -mabi=64.  If it fails, remove mabi=64
        from multidirs.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@26355 138bc75d-0d04-0410-961f-82ee72b054a4