fix warning for PostgreSQL 10

Author: okbob

src/stmtwalk.c

@@ -24,7 +24,6 @@ static void check_stmts(PLpgSQL_checkstate *cstate, List *stmts, int *closing, L
 static PLpgSQL_stmt_stack_item * push_stmt_to_stmt_stack(PLpgSQL_checkstate *cstate);
 static void pop_stmt_from_stmt_stack(PLpgSQL_checkstate *cstate);
 static bool is_any_loop_stmt(PLpgSQL_stmt *stmt);
-static bool is_inside_protected_block(PLpgSQL_stmt_stack_item *current);
 static bool is_inside_exception_handler(PLpgSQL_stmt_stack_item *current);
 static PLpgSQL_stmt * find_nearest_loop(PLpgSQL_stmt_stack_item *current);
 static PLpgSQL_stmt * find_stmt_with_label(char *label, PLpgSQL_stmt_stack_item *current);
@@ -45,6 +44,12 @@ static void check_dynamic_sql(PLpgSQL_checkstate *cstate, PLpgSQL_stmt *stmt, PL
 
 #if PG_VERSION_NUM >= 110000
 
+static bool is_inside_protected_block(PLpgSQL_stmt_stack_item *current);
+
+#endif
+
+#if PG_VERSION_NUM >= 110000
+
 static void
 check_variable(PLpgSQL_checkstate *cstate, PLpgSQL_variable *var)
 {
@@ -1588,6 +1593,8 @@ find_nearest_loop(PLpgSQL_stmt_stack_item *current)
 	return NULL;
 }
 
+#if PG_VERSION_NUM >= 110000
+
 /*
  * Returns true, when some outer block handles exceptions.
  * It is used for check of correct usage of COMMIT or ROLLBACK.
@@ -1611,6 +1618,8 @@ is_inside_protected_block(PLpgSQL_stmt_stack_item *current)
 	return false;
 }
 
+#endif
+
 /*
  * This is used for check of correct usage GET STACKED DIAGNOSTICS
  */