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)
diff --git a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
index 229cc7a..a4dbf53 100644
--- a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
+++ b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
@@ -80,7 +80,8 @@
   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'),
diff --git a/src/version.c b/src/version.c
index 2a2cefe..e83549c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1264,
+/**/
     1263,
 /**/
     1262,