patch 7.4.1529

Problem:    Specifying buffer number for channel not implemented yet.
Solution:   Implement passing a buffer number.

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1529,
 /**/
     1528,
 /**/