patch 8.1.1385: signed/unsigned compiler warning

Problem:    Signed/unsigned compiler warning.
Solution:   Use STRLEN() instead of strlen().
diff --git a/src/version.c b/src/version.c
index 678d7e8..a66b7a5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1385,
+/**/
     1384,
 /**/
     1383,