patch 7.4.2171
Problem:    MS-Windows build fails.
Solution:   Add QueryPerformanceCounter().
diff --git a/src/version.c b/src/version.c
index b1be507..98dd5f4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -764,6 +764,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2171,
+/**/
     2170,
 /**/
     2169,