patch 8.0.1784: gvim test gets stuck in dialog

Problem:    Gvim test gets stuck in dialog.
Solution:   Rename the file used.

src/testdir/test_quickfix.vim

@@ -1154,18 +1154,18 @@ func Test_efm2()
 
   " Test for %o
   set efm=%f(%o):%l\ %m
-  cgetexpr ['Xtestfile(Language.PureScript.Types):20 Error']
-  call writefile(['Line1'], 'Xtestfile')
+  cgetexpr ['Xotestfile(Language.PureScript.Types):20 Error']
+  call writefile(['Line1'], 'Xotestfile')
   let l = getqflist()
   call assert_equal(1, len(l), string(l))
   call assert_equal('Language.PureScript.Types', l[0].module)
   copen
   call assert_equal('Language.PureScript.Types|20| Error', getline(1))
   call feedkeys("\<CR>", 'xn')
-  call assert_equal('Xtestfile', expand('%:t'))
+  call assert_equal('Xotestfile', expand('%:t'))
   cclose
   bd
-  call delete("Xtestfile")
+  call delete("Xotestfile")
 
   " The following sequence of commands used to crash Vim
   set efm=%W%m

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1784,
 /**/
     1783,
 /**/