patch 9.1.0639: channel timeout may wrap around

Problem:  channel timeout may wrap around
Solution: Correct timeout calculation when GetTickCount() wraps around
          (Ken Takata)

closes: #15390

Signed-off-by: Ken Takata <kentkt@csc.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index f8d1762..97414a0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    639,
+/**/
     638,
 /**/
     637,