win32: Add a missing include

We are using round() now, so include math.h.

diff --git a/gdk/win32/gdkdevice-win32.c b/gdk/win32/gdkdevice-win32.c
index 8d42f5389e4927cf4926a66f0e29911df263dd94..bea82f991f9ff50d906a7aa7429c083e2f4f490d 100644 (file)
--- a/gdk/win32/gdkdevice-win32.c
+++ b/gdk/win32/gdkdevice-win32.c
@@ -21,6 +21,7 @@
 
 #include <windowsx.h>
 #include <objbase.h>
+#include <math.h>
 
 #include "gdkdevice-win32.h"
 #include "gdkwin32.h"