patch 8.0.0417: test for the clipboard fails sometimes

Problem:    Test for the clipboard fails sometimes.
Solution:   Add it to the flaky tests.
diff --git a/src/version.c b/src/version.c
index 98fa4a8..220e00d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    417,
+/**/
     416,
 /**/
     415,