patch 9.0.1148: cmdline test fails in the GUI

Problem:    Cmdline test fails in the GUI.
Solution:   Skip the test when running in the GUI.

src/testdir/test_cmdline.vim

@@ -655,6 +655,9 @@ func Test_getcompletion()
 endfunc
 
 func Test_multibyte_expression()
+  " Get a dialog in the GUI
+  CheckNotGui
+
   " This was using uninitialized memory.
   let lines =<< trim END
       set verbose=6

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1148,
 /**/
     1147,
 /**/