patch 8.1.2337: double-click time sometimes miscomputed

Problem:    Double-click time sometimes miscomputed.
Solution:   Correct time computation. (Dominique Pelle, closes #5259)
diff --git a/src/version.c b/src/version.c
index 137db0e..996c3c5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -738,6 +738,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2337,
+/**/
     2336,
 /**/
     2335,