Get rid of underscore.c

[Andrew Cagney]

> +static const char *
> +hp_symbol_characters PARAMS ((void));
> +
> +/* Return the string of non-alnum characters that may occur 
> +   as a valid symbol component, in the standard assembler symbol
> +   syntax.  */
> +
> +static const char *
> +standard_symbol_characters ()
> +{
> +  return "_$.";
> +}
> +

Just FYI,

Code like this needs to be pushed into libiberty where GDB can also use 
it.  At present GDB has its own equivalent of these operations :-(

Andrew