- Fixing a compilation error caused by me in rev 9414: -.-;

  utils.h:35: error: syntax error before "va_list"

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@9416 54d463be-8e91-2dee-dedb-b68131a5f0ec

src/common/utils.h

@@ -4,6 +4,7 @@
 #ifndef COMMON_UTILS_H
 #define COMMON_UTILS_H
 
+#include <stdarg.h>
 
 #ifndef NULL
 #define NULL (void *)0