patch 7.4.1288

Problem:    ch_sendexpr() does not use JS encoding.
Solution:   Use the encoding that fits the channel mode.  Refuse using
            ch_sendexpr() on a raw channel.

src/version.c

@@ -747,6 +747,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1288,
 /**/
     1287,
 /**/