Fix bogus duplicate attribute errors for submodule functions.

Fix bogus duplicate attribute errors for submodule functions.

        PR fortran/83113
        * array.c: Do not attempt to set the array spec for a submodule
        function symbol (as it has already been set in the corresponding
        module procedure interface).
        * symbol.c: Do not reject duplicate POINTER, ALLOCATABLE, or
        DIMENSION attributes in declarations of a submodule function.
        * gfortran.h: Add a macro that tests for a module procedure in a
        submodule.
        * gfortran.dg/pr83113.f90: New test.