Initialize WIN_CritSection earlier.

diff --git a/include/win.h b/include/win.h
index aa366b9..e15fb09 100644
--- a/include/win.h
+++ b/include/win.h
@@ -158,6 +158,7 @@
 #define BWA_SKIPICONIC		0x0008
 
   /* Window functions */
+extern void   WIN_Init( void );
 extern void   WIN_LockWnds();
 extern void   WIN_UnlockWnds();
 extern int    WIN_SuspendWndsLock();