patch 7.4.1667
Problem:    Win32: waiting on a pipe with fixed sleep time.
Solution:   Start with a short delay and increase it when looping.
diff --git a/src/version.c b/src/version.c
index 5a55707..ae5d4b0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1667,
+/**/
     1666,
 /**/
     1665,