patch 8.0.0977: cannot send lines to a terminal job on MS-Windows

Problem:    Cannot send lines to a terminal job on MS-Windows.
Solution:   Set jv_in_buf.  Command doesn't get EOF yet though.

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    977,
 /**/
     976,
 /**/