patch 8.0.1655: outdated gdb message in terminal debugger unclear

Problem:    Outdated gdb message in terminal debugger unclear.
Solution:   Specifically mention the required gdb version.  Avoid getting
            stuck on pagination.

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

@@ -116,7 +116,7 @@ func s:StartDebug(cmd)
       if term_getline(s:gdbbuf, lnum) =~ 'new-ui mi '
 	let response = term_getline(s:gdbbuf, lnum + 1)
 	if response =~ 'Undefined command'
-	  echoerr 'Your gdb does not support the Machine Interface feature'
+	  echoerr 'Sorry, your gdb is too old, gdb 7.12 is required'
 	  exe 'bwipe! ' . s:ptybuf
 	  exe 'bwipe! ' . s:commbuf
 	  return
@@ -143,6 +143,10 @@ func s:StartDebug(cmd)
   " running.
   call s:SendCommand('-gdb-set mi-async on')
 
+  " Disable pagination, it causes everything to stop at the gdb
+  " "Type <return> to continue" prompt.
+  call s:SendCommand('-gdb-set pagination off')
+
   " Sign used to highlight the line where the program has stopped.
   " There can be only one.
   sign define debugPC linehl=debugPC

src/version.c

@@ -762,6 +762,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1655,
 /**/
     1654,
 /**/