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Avoid warnings about non used parameters in prototypes

Obviously parameters in prototypes are not going to be used ever,
so it is a really stupid warning.

--- a/cc1/code.c

+++ b/cc1/code.c

@@ -327,8 +327,11 @@

 	puts("\t{");

 	n = sym->type->n.elem;

-	for (sp = sym->u.pars; n-- > 0; ++sp)

+	for (sp = sym->u.pars; n-- > 0; ++sp) {

+		/* enable non used warnings in parameters */

+		(*sp)->flags &= ~ISUSED;

 		emit(ODECL, *sp);

+	}

 	puts("-");

 }

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -157,6 +157,7 @@

 			error("redefinition of parameter '%s'", name);

 	}

 	sym->type = tp;

+	sym->flags |= ISUSED;    /* avoid non used warnings in prototypes */

 	if (n++ == NR_FUNPARAM)

 		error("too much parameters in function definition");