patch 9.0.1715: duplicate test in message_test.c

Problem: duplicate test in message_test.c
Solution: Remove duplicate test and make functions static

closes: #12803

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
diff --git a/src/version.c b/src/version.c
index fa45168..c759da9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1715,
+/**/
     1714,
 /**/
     1713,