PR [C/C++/Fortran/Java] 28875 "-Wextra -Wno-unused-parameter -Wall" doesn't work as expected

[Manuel López-Ibáñez]

This fixes 28875 and makes the whole handling of Wunused much less complicated.

Bootstrapped and regression tested on x86_64-unknown-linux-gnu with
--enable-languages=all.

OK for trunk?

2008-08-08  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	PR 28875
	* flags.h (set_Wunused): Delete
	* toplev.c (process_options): Handle Wunused flags here.
	* opts.c (maybe_warn_unused_parameter): Delete.
	(common_handle_option): Replace set_Wunused by warn_unused.
	(set_Wextra): Do not handle Wunused-parameter here.
	(set_Wunused): Delete.
	* c-opts.c (c_common_handle_option): Replace set_Wunused by
	warn_unused.
	* common.opt (Wunused): Add Var and Init.
	(Wunused-function): Likewise.
	(Wunused-label): Likewise.
	(Wunused-parameter): Likewise.
	(Wunused-value): Likewise.
	(Wunused-variable): Likewise.
	
fortran/
	* options.c (set_Wall): Replace set_Wunused by warn_unused.
java/	
	* lang.c (java_handle_option): Replace set_Wunused with
	warn_unused.
testsuite/
	* gcc.dg/unused-6-no.c: New.
	* gcc.dg/unused-6-WallWextra.c: New.
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