Fix "warning: no previous prototype for ‘XevieExtensionInit’".

Xext/xevie.c

@@ -55,6 +55,7 @@ of the copyright holder.
 #include <xkbsrv.h>
 
 #include "../os/osdep.h"
+#include "modinit.h"
 
 #define NoSuchEvent 0x80000000
 

hw/xfree86/dixmods/extmod/modinit.h

@@ -112,6 +112,10 @@ extern void SELinuxExtensionInit(INITARGS);
 #include "xselinux.h"
 #endif
 
+#ifdef XEVIE
+extern void XevieExtensionInit(INITARGS);
+#endif
+
 #if 1
 extern void SecurityExtensionInit(INITARGS);
 #endif