re PR libfortran/18791 (CABS specifics declared of wrong type)

re PR libfortran/18791 (CABS specifics declared of wrong type)

        PR fortran/18791

        * gfortran.dg/specifics_1.f90: New test.
        * gfortran.fortran-torture/execute/specifics.f90: Add tests for
        complex specifics.

        * m4/specific.m4: Special-case cabs so that its return type is
        real. Special-case conjg so that their suffices are _4, _8, _10 and
        _16 instead of _c4, _c8, _c10 and _c16.
        * intrinsics/f2c_specifics.F90: Special-case conjg functions so
        that their suffices are _4 and _8 instead of _c4 and _c8.
        * generated/_conjg_c4.F90: Regenerate.
        * generated/_conjg_c8.F90: Regenerate.
        * generated/_conjg_c10.F90: Regenerate.
        * generated/_conjg_c16.F90: Regenerate.
        * generated/_abs_c4.F90: Regenerate.
        * generated/_abs_c8.F90: Regenerate.
        * generated/_abs_c10.F90: Regenerate.
        * generated/_abs_c16.F90: Regenerate.

From-SVN: r117317