Add missing <winnt.h> include in windows/lang_table.h
Add missing typedefs.h and rid.h include in godot_constraint_3d.h
Add missing <type_traits> include in iterable.h
Add missing forward declarations in rendering_shader_library.h
Metal Support contributed by Migeran (https://migeran.com) and Stuart Carnie.
Co-authored-by: Stuart Carnie <stuart.carnie@gmail.com>
Co-authored-by: Gergely Kis <gergely.kis@migeran.com>