patch 9.1.0939: make installtutor fails

Problem:  make installtutor fails
          (Antonio Giovanni Colombo, after v9.1.0932)
Solution: Fix Makefile rule

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 1bf1163..bee9e95 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    939,
+/**/
     938,
 /**/
     937,