uctx: bind gstate_protect and gstate_unprotect

components/micropython/usermodule/mp_uctx.c

@@ -198,6 +198,8 @@ MP_CTX_TEXT_FUN(parse);
 MP_CTX_COMMON_FUN_0(begin_path);
 MP_CTX_COMMON_FUN_0(save);
 MP_CTX_COMMON_FUN_0(restore);
+MP_CTX_COMMON_FUN_0(gstate_protect);
+MP_CTX_COMMON_FUN_0(gstate_unprotect);
 
 MP_CTX_COMMON_FUN_0(start_frame);
 MP_CTX_COMMON_FUN_0(end_frame);
@@ -839,6 +841,8 @@ static const mp_rom_map_elem_t mp_ctx_locals_dict_table[] = {
     MP_CTX_METHOD(image),
     MP_CTX_METHOD(save),
     MP_CTX_METHOD(restore),
+    MP_CTX_METHOD(gstate_protect),
+    MP_CTX_METHOD(gstate_unprotect),
     MP_CTX_METHOD(start_frame),
     MP_CTX_METHOD(end_frame),
     MP_CTX_METHOD(get_font_name),