patch 9.0.1106: not all postfix files are recognized

Problem:    Not all postfix files are recognized.
Solution:   Recognize main.cf.proto files. (closes #11732)
diff --git a/src/version.c b/src/version.c
index 2f0c73c..9c9d025 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1106,
+/**/
     1105,
 /**/
     1104,