configure.ac: Add target powerpc64-*-freebsd*.

2010-08-09  Andreas Tobler  <andreast@fgznet.ch>

        * configure.ac: Add target powerpc64-*-freebsd*.
        * configure: Regenerate.
        * testsuite/libffi.call/cls_align_longdouble_split.c: Pass
        -mlong-double-128 only to linux targets.
        * testsuite/libffi.call/cls_align_longdouble_split2.c: Likewise.
        * testsuite/libffi.call/cls_longdouble.c: Likewise.
        * testsuite/libffi.call/huge_struct.c: Likewise.

From-SVN: r163030