patch 9.0.1355: no error when declaring a class twice

Problem:    No error when declaring a class twice. (Ernie Rael)
Solution:   Pass different flags when declaring the class. (closes #12057)
diff --git a/src/version.c b/src/version.c
index 315f91e..785f76e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1355,
+/**/
     1354,
 /**/
     1353,