patch 8.0.1840: getwinpos() is not tested

Problem:    getwinpos() is not tested.
Solution:   Add a test. (Dominique Pelle, closes #2911)
diff --git a/src/version.c b/src/version.c
index a9348ef..34b0113 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1840,
+/**/
     1839,
 /**/
     1838,