Remove unncessary function declarations in ada-typeprint.c.

Remove unncessary function declarations in ada-typeprint.c.

These declarations are unncessary, and make it extra work when trying
to change the profile of one of these functions. This patch just
removes them.

Note that one of them (print_dynamic_range_bound), was improperly
indented.

gdb/ChangeLog:

        * ada-typeprint.c (print_array_type, print_choices, print_range)
        (print_range_bound, print_dynamic_range_bound, print_range_type):
        Remove declaration.