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/testdir/runtest.vim b/src/testdir/runtest.vim
index 71028a1..d750da5 100644
--- a/src/testdir/runtest.vim
+++ b/src/testdir/runtest.vim
@@ -168,6 +168,7 @@
       \ 'Test_oneshot()',
       \ 'Test_pipe_through_sort_all()',
       \ 'Test_pipe_through_sort_some()',
+      \ 'Test_quoteplus()',
       \ 'Test_reltime()',
       \ ]
 
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,