chore: ast: Fix formatting and includes

gcc/rust/ChangeLog:

	* ast/rust-ast-builder.cc: Remove extra include, fix new formatting.

Author: CohenArthur

gcc/rust/ast/rust-ast-builder.cc

@@ -28,7 +28,6 @@
 #include "rust-pattern.h"
 #include "rust-system.h"
 #include "rust-token.h"
-#include <memory>
 
 namespace Rust {
 namespace AST {