put function prototype for ShapeExtensionInit() in proper place

based on FIXME in mi/miinitext.c

Xext/shape.c

@@ -146,7 +146,7 @@ typedef struct _ShapeEvent {
  ****************/
 
 void
-ShapeExtensionInit(INITARGS)
+ShapeExtensionInit(void)
 {
     ExtensionEntry *extEntry;
 

hw/xfree86/dixmods/extmod/modinit.h

@@ -10,7 +10,6 @@
 #endif
 
 #ifdef SHAPE
-extern void ShapeExtensionInit(INITARGS);
 #define _SHAPE_SERVER_  /* don't want Xlib structures */
 #include <X11/extensions/shapestr.h>
 #endif

include/window.h

@@ -256,6 +256,8 @@ void ResizeChildrenWinSize(
     int /*dw*/,
     int /*dh*/);
 
+extern void ShapeExtensionInit(void);
+
 extern void SendShapeNotify(
     WindowPtr /* pWin */,
     int /* which */ );

mi/miinitext.c

@@ -258,9 +258,6 @@ typedef void (*InitExtension)(INITARGS);
 #endif
 
 /* FIXME: this whole block of externs should be from the appropriate headers */
-#ifdef SHAPE
-extern void ShapeExtensionInit(INITARGS);
-#endif
 #ifdef EVI
 extern void EVIExtensionInit(INITARGS);
 #endif