Revert "mi: unexport miClearToBackground()"

This reverts commit 3856b6cb5e.

mi/mi.h

@@ -286,6 +286,14 @@ extern _X_EXPORT void miPolylines(DrawablePtr pDrawable,
 
 /* miwindow.c */
 
+extern _X_EXPORT void miClearToBackground(WindowPtr /*pWin */ ,
+                                          int /*x */ ,
+                                          int /*y */ ,
+                                          int /*w */ ,
+                                          int /*h */ ,
+                                          Bool  /*generateExposures */
+    );
+
 extern _X_EXPORT void miMarkWindow(WindowPtr    /*pWin */
     );
 

mi/mi_priv.h

@@ -52,7 +52,4 @@ int miShapedWindowIn(RegionPtr universe, RegionPtr bounding, BoxPtr rect,
                      int x, int y);
 int miValidateTree(WindowPtr pParent, WindowPtr pChild, VTKind kind);
 
-void miClearToBackground(WindowPtr pWin, int x, int y, int w, int h,
-                         Bool generateExposures);
-
 #endif /* _XSERVER_MI_PRIV_H */

mi/miwindow.c

@@ -50,10 +50,10 @@ SOFTWARE.
 #include <X11/extensions/shapeconst.h>
 
 #include "dix/input_priv.h"
-#include "mi/mi_priv.h"
 
 #include "regionstr.h"
 #include "region.h"
+#include "mi.h"
 #include "windowstr.h"
 #include "scrnintstr.h"
 #include "pixmapstr.h"