[gold][patch] Remove unused argument/member

[Ian Lance Taylor]

Rafael Espindola <espindola@google.com> writes:

> 2010-03-12   Rafael Espindola  <espindola@google.com>
>
> 	* readsyms.cc (Read_symbols::do_read_symbols): Update calls to
> 	Add_symbols' constructor.
> 	* readsyms.h (Add_symbols): Remove the input_group member.

This is OK.

Thanks.

Ian