Modify multiple definition error

Modify multiple definition error

gcc/rust/ChangeLog:

	* resolve/rust-ast-resolve-expr.cc
	(ResolveExpr::visit): Modify error message.
	* resolve/rust-ast-resolve-implitem.h
	(ResolveToplevelImplItem::visit): Likewise.
	(ResolveTopLevelTraitItems::visit): Likewise.
	(ResolveToplevelExternItem::visit): Likewise.
	* resolve/rust-ast-resolve-stmt.cc
	(ResolveStmt::visit): Likewise.
	* resolve/rust-ast-resolve-stmt.h
	(ResolveStmt::visit): Likewise.
	* resolve/rust-ast-resolve-toplevel.h
	(ResolveTopLevel::visit): Likewise.
	* resolve/rust-ast-resolve-type.h
	(ResolveGenericParams::visit): Likewise.

gcc/testsuite/ChangeLog:

	* rust/compile/nr2/exclude: Remove entries.
	* rust/compile/redef_error2.rs: Modify expected error.
	* rust/compile/redef_error5.rs: Likewise.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>