patch 7.4.1297

Problem:    On Mac test_channel leaves python instances running.
Solution:   Use a small waittime to make ch_open() work. (Ozaki Kiichi)

src/version.c

@@ -747,6 +747,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1297,
 /**/
     1296,
 /**/