patch 8.0.0480: the remote_peek() test fails on MS-Windows

Problem:    The remote_peek() test fails on MS-Windows.
Solution:   Check for pending messages. Also report errors in the first run if
            a flaky test fails twice.
diff --git a/src/version.c b/src/version.c
index cfafa3f..69b4990 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    480,
+/**/
     479,
 /**/
     478,