patch 8.0.1670: terminal window tests are still a bit flaky

Problem:    Terminal window tests are still a bit flaky.
Solution:   Increase the waiting time for the buffer to be created.
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index 218b4ca..cd7a2b2 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -1061,7 +1061,7 @@
 	\ "set t_ts=",
 	\ ], 'Xscript')
   let buf = RunVimInTerminal('-S Xscript', {})
-  call WaitFor({-> bufnr('Xtextfile') > 0})
+  call WaitFor({-> bufnr('Xtextfile') > 0}, 2000)
   call assert_equal('Xtextfile', expand('%:t'))
   call assert_true(winnr('$') >= 3)
   return buf
diff --git a/src/version.c b/src/version.c
index 813bcfa..59ca7a8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1670,
+/**/
     1669,
 /**/
     1668,