patch 7.4.1291

Problem:    On MS-Windows the channel test server doesn't quit.
Solution:   Use return instead of break. (Ken Takata)

src/testdir/test_channel.py

@@ -133,7 +133,7 @@ class ThreadedTCPRequestHandler(socketserver.BaseRequestHandler):
                     elif decoded[1] == '!quit!':
                         # we're done
                         self.server.shutdown()
-                        break
+                        return
                     elif decoded[1] == '!crash!':
                         # Crash!
                         42 / 0

src/version.c

@@ -747,6 +747,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1291,
 /**/
     1290,
 /**/