c++: Fix spelling of non-static

c++: Fix spelling of non-static

I was looking at DR 296 and noticed that we say "nonstatic" instead of
"non-static", which is the version the standard uses.  So this patch
fixes the spelling throughout the front end.  Did not check e.g.
non-dependent or any other.

	* decl.c (grok_op_properties): Fix spelling of non-static.
	* typeck.c (build_class_member_access_expr): Likewise.

	* g++.dg/other/operator1.C: Adjust expected message.
	* g++.dg/overload/operator2.C: Likewise.
	* g++.dg/template/error30.C: Likewise.
	* g++.old-deja/g++.jason/operator.C: Likewise.