* Makefile.in (FPBIT_FUNCS, DPBIT_FUNCS): Add _sf_to_usi
    _df_to_usi.  Required by some targets, so US_SOFTWARE_GOFAST calls to
    functions like dptoul will be resolved.
    (libgcc2.a): Make sure that the object files from DPBIT are named
    differently (prefix `_dp') from those that would be coming from
    FPBIT.

From-SVN: r30828