patch 8.0.1076: term_start() does not take callbacks

Problem:    term_start() does not take callbacks. When using two terminals
            without a job only one is read from.  A terminal without a window
            returns the wrong pty.
Solution:   Support "callback", "out_cb" and "err_cb".  Fix terminal without a
            window. Fix reading from multiple channels.

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1076,
 /**/
     1075,
 /**/