gccrs: We cant clone types as it will dup the node-id

gccrs: We cant clone types as it will dup the node-id

This patch ensuers we reuse the Builder for new type to
ensure we create a new type from scratch ensuring consistent
new node-ids.

gcc/rust/ChangeLog:

	* expand/rust-derive-default.cc (DeriveDefault::visit_struct): use builder
	(DeriveDefault::visit_tuple): likewise
	* expand/rust-derive-eq.cc (DeriveEq::visit_tuple): likewise
	(DeriveEq::visit_struct): likewise
	(DeriveEq::visit_enum): likewise
	(DeriveEq::visit_union): likewise

gcc/testsuite/ChangeLog:

	* rust/compile/nr2/exclude: these are fixed now

Signed-off-by: Philip Herron <herron.philip@googlemail.com>