patch 8.2.0935: flattening a list with existing code is slow

Problem:    Flattening a list with existing code is slow.
Solution:   Add flatten(). (Mopp, closes #3676)
diff --git a/src/version.c b/src/version.c
index 04f61c9..d992e9b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    935,
+/**/
     934,
 /**/
     933,