gccrs: fix bad type inference on local patterns

gccrs: fix bad type inference on local patterns

We do not need to inject inference variables on generic patterns
with generic blocks. This will just cause unconstrained inference
variables as they may not unify against something.

Fixes Rust-GCC#2323

gcc/rust/ChangeLog:

	* typecheck/rust-hir-type-check-path.cc (TypeCheckExpr::resolve_root_path): dont infer here

gcc/testsuite/ChangeLog:

	* rust/compile/nr2/exclude: nr2 cant handle this
	* rust/compile/issue-2323.rs: New test.

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