gccrs: add diagnostic for E0229 no associated type arguments allowed here

gccrs: add diagnostic for E0229 no associated type arguments allowed here

It seems bounds in qualified paths are not allowed to specify associated
type bindings because its going to be associated with the impl block
anyway.

Fixes Rust-GCC#2369

gcc/rust/ChangeLog:

	* typecheck/rust-hir-type-check-base.h: add flag
	* typecheck/rust-hir-type-check-type.cc (TypeCheckType::visit): likewise
	* typecheck/rust-tyty-bounds.cc: new diagnostic

gcc/testsuite/ChangeLog:

	* rust/compile/issue-2369.rs: New test.

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