variadic function: fix syntax

Change-Id: If7cb720049169b99e6735a792534476281b26df1
diff --git a/minuitwrp/events.cpp b/minuitwrp/events.cpp
index b5e5a14..e497df6 100644
--- a/minuitwrp/events.cpp
+++ b/minuitwrp/events.cpp
@@ -50,6 +50,7 @@
 #endif
 
 #include "common.h"
+#include "twcommon.h"
 
 #include "minuitwrp/minui.h"