Alloc sprite memory in devices' devPrivates, allow undisplaying cursors.

Improve memory usage by allocating the sprite's memory only to devices that
actually have a sprite and provide means to remove a device's cursor from the
screen (more hotplugging, yay!).
This commit breaks ScreenRec's ABI.

1 files changed, 2 insertions, 0 deletions

diff --git a/include/input.h b/include/input.h
index 765d71dc3..2debce93c 100644
--- a/include/input.h
+++ b/include/input.h
@@ -190,6 +190,8 @@ extern int InitAndStartDevices(void);
 
 extern void CloseDownDevices(void);
 
+extern void UndisplayDevices(void);
+
 extern int RemoveDevice(
     DeviceIntPtr /*dev*/);