py/emitnative: Add support for using setjmp with native emitter.

To enable this feature the N_NLR_SETJMP macro should be set to 1 before
including py/emitnative.c.

py/nativeglue.c

@@ -244,7 +244,11 @@ const void *const mp_fun_table[MP_F_NUMBER_OF] = {
     mp_call_method_n_kw_var,
     mp_native_getiter,
     mp_native_iternext,
+    #if MICROPY_NLR_SETJMP
+    nlr_push_tail,
+    #else
     nlr_push,
+    #endif
     nlr_pop,
     mp_native_raise,
     mp_import_name,
@@ -262,6 +266,11 @@ const void *const mp_fun_table[MP_F_NUMBER_OF] = {
     mp_small_int_floor_divide,
     mp_small_int_modulo,
     mp_native_yield_from,
+    #if MICROPY_NLR_SETJMP
+    setjmp,
+    #else
+    NULL,
+    #endif
 };
 
 #endif // MICROPY_EMIT_NATIVE