fix: systable header file compile issue

include/common/systable.h

@@ -12,6 +12,9 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
+ 
+#ifndef TDENGINE_SYSTABLE_H
+#define TDENGINE_SYSTABLE_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -19,9 +22,6 @@ extern "C" {
 
 #include "os.h"
 
-#ifndef TDENGINE_SYSTABLE_H
-#define TDENGINE_SYSTABLE_H
-
 #define TSDB_INFORMATION_SCHEMA_DB       "information_schema"
 #define TSDB_INS_TABLE_DNODES            "ins_dnodes"
 #define TSDB_INS_TABLE_MNODES            "ins_mnodes"