Added missing include that sometimes causes build errors about INT64_MAX.

Author: featherfeet

gnucash/gnome/dialog-sx-since-last-run.c

@@ -35,6 +35,7 @@
 #include <config.h>
 #include <glib.h>
 #include <gtk/gtk.h>
+#include <stdint.h>
 
 #include "dialog-utils.h"
 #include "gnc-sx-instance-model.h"