patch 7.4.1510
Problem:    Channel test fails on AppVeyor.
Solution:   Wait longer than 10 msec if needed.
diff --git a/src/version.c b/src/version.c
index 417a0e3..e2615be 100644
--- a/src/version.c
+++ b/src/version.c
@@ -744,6 +744,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1510,
+/**/
     1509,
 /**/
     1508,