patch 8.2.5147: flaky test always fails on retry

Problem:    Flaky test always fails on retry.
Solution:   Delete the created function.

src/testdir/test_search.vim

@@ -353,6 +353,7 @@ func Test_searchpair_timeout()
   let elapsed = reltime(starttime)->reltimefloat()
   call assert_inrange(0.09, 0.300, elapsed)
 
+  delfunc Waitabit
   bwipe!
 endfunc
 

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    5147,
 /**/
     5146,
 /**/