py: Move to guarded includes for compile.h and related headers.

py/emitglue.h

@@ -23,6 +23,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+#ifndef __MICROPY_INCLUDED_PY_EMITGLUE_H__
+#define __MICROPY_INCLUDED_PY_EMITGLUE_H__
 
 // These variables and functions glue the code emitters to the runtime.
 
@@ -59,3 +61,5 @@ void mp_emit_glue_assign_native(mp_raw_code_t *rc, mp_raw_code_kind_t kind, void
 
 mp_obj_t mp_make_function_from_raw_code(mp_raw_code_t *rc, mp_obj_t def_args, mp_obj_t def_kw_args);
 mp_obj_t mp_make_closure_from_raw_code(mp_raw_code_t *rc, mp_uint_t n_closed_over, const mp_obj_t *args);
+
+#endif // __MICROPY_INCLUDED_PY_EMITGLUE_H__