patch 8.0.1264: terminal debugger gets stuck in small window

Problem:    Terminal debugger gets stuck in small window.
Solution:   Add "-quiet" to the gdb command. (Christian Brabandt, closes #2154)

runtime/pack/dist/opt/termdebug/plugin/termdebug.vim

@@ -80,7 +80,8 @@ func s:StartDebug(cmd)
   let commpty = job_info(term_getjob(s:commbuf))['tty_out']
 
   " Open a terminal window to run the debugger.
-  let cmd = [g:termdebugger, '-tty', pty, a:cmd]
+  " Add -quiet to avoid the intro message causing a hit-enter prompt.
+  let cmd = [g:termdebugger, '-quiet', '-tty', pty, a:cmd]
   echomsg 'executing "' . join(cmd) . '"'
   let gdbbuf = term_start(cmd, {
 	\ 'exit_cb': function('s:EndDebug'),

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1264,
 /**/
     1263,
 /**/