patch 8.1.0777: Win32: using pipes for channel does not work well

Problem:    Win32: using pipes for channel does not work well.
Solution:   Use a larger buffer and handle overlaps. (Yasuhiro Matsumoto,
            closes #3782)

src/version.c

@@ -791,6 +791,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    777,
 /**/
     776,
 /**/