patch 8.0.1259: search test can be flaky

Problem:    Search test can be flaky.
Solution:   Use WaitFor() instead of a delay.  Make it possible to pass a
            funcref to WaitFor() to avoid the need for global variables.
            (James McCoy, closes #2282)

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1259,
 /**/
     1258,
 /**/