Revert "mi: drop now obsolete mioverlay.h"

This reverts commit 6825f89cd2.

Requested by Nvidia - their proprietary driver still needs it.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1843>

hw/xfree86/sdksyms.sh

@@ -199,6 +199,7 @@ cat > sdksyms.c << EOF
 #include "mizerarc.h"
 #include "micoord.h"
 #include "mistruct.h"
+#include "mioverlay.h"
 
 
 /* randr/Makefile.am */

mi/meson.build

@@ -32,6 +32,7 @@ hdrs_mi = [
   'migc.h',
   'mi.h',
   'miline.h',
+  'mioverlay.h',
   'mipointer.h',
   'mipointrst.h',
   'mistruct.h',

mi/mioverlay.h

@@ -0,0 +1,12 @@
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#ifndef __MIOVERLAY_H
+#define __MIOVERLAY_H
+
+typedef void (*miOverlayTransFunc) (ScreenPtr, int, BoxPtr);
+typedef Bool (*miOverlayInOverlayFunc) (WindowPtr);
+
+#endif                          /* __MIOVERLAY_H */