re PR fortran/31202 (Incorrect rounding generated for NINT)

re PR fortran/31202 (Incorrect rounding generated for NINT)

        PR fortran/31202

        * f95-lang.c (gfc_init_builtin_functions): Defin builtins for
        lround{f,,l} and llround{f,,l}.
        * trans-intrinsic.c (build_fix_expr): Generate calls to the
        {l,}round{f,,l} functions.

        * intrinsics/c99_functions.c (roundl,lroundf,lround,lroundl,
        llroundf,llround,llroundl): New functions.
        * c99_protos.h (roundl,lroundf,lround,lroundl,llroundf,llround,
        llroundl): New prototypes.
        * configure.ac: Check for lroundf, lround, lroundl, llroundf,
        llround and llroundl.
        * configure: Regenerate.
        * Makefile.in: Regenerate.
        * config.h.in: Regenerate.

        * gfortran.dg/nint_2.f90: New test.

From-SVN: r127185