patch 8.1.1298: invalid argument test fails without X clipboard

Problem:    Invalid argument test fails without X clipboard.
Solution:   Test -display only with the +xterm_clipboard feature.

src/testdir/test_startup.vim

@@ -430,7 +430,7 @@ func Test_invalid_args()
     call assert_equal('More info with: "vim -h"',            out[2])
   endif
 
-  if has('clipboard')
+  if has('xterm_clipboard')
     let out = split(system(GetVimCommand() .. ' -display'), "\n")
     call assert_equal(1, v:shell_error)
     call assert_match('^VIM - Vi IMproved .* (.*)$',         out[0])

src/version.c

@@ -767,6 +767,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1298,
 /**/
     1297,
 /**/