patch 8.1.1184: undo file left behind after running test

Problem:    Undo file left behind after running test.
Solution:   Delete the undo file. (Dominique Pelle, closes #4279)
diff --git a/src/testdir/test_filechanged.vim b/src/testdir/test_filechanged.vim
index 43f752d..ce78609 100644
--- a/src/testdir/test_filechanged.vim
+++ b/src/testdir/test_filechanged.vim
@@ -86,6 +86,7 @@
 
   au! testreload
   bwipe!
+  call delete(undofile('Xchanged_r'))
   call delete('Xchanged_r')
 endfunc
 
diff --git a/src/version.c b/src/version.c
index 872e815..308beed 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1184,
+/**/
     1183,
 /**/
     1182,