patch 8.1.1047: WINCH signal is not tested

Problem:    WINCH signal is not tested.
Solution:   Add a test. (Dominique Pelle, closes #4158)
diff --git a/src/version.c b/src/version.c
index 3a195e5..cb044bc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -776,6 +776,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1047,
+/**/
     1046,
 /**/
     1045,