patch 7.4.2016
Problem:    Warning from MinGW about _WIN32_WINNT redefined. (John Marriott)
Solution:   First undefine it. (Ken Takata)
diff --git a/src/version.c b/src/version.c
index b2dc76e..cce37b1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -759,6 +759,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2016,
+/**/
     2015,
 /**/
     2014,