[mutter] backend/native: Remove left-over function declaration

[Marge Bot <marge-bot src gnome org>]

commit 41246cb31d4713216ec619609a0b093203a831d3
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon Jan 18 22:37:38 2021 +0100

    backend/native: Remove left-over function declaration
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1689>

 src/backends/native/meta-backend-native.h | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/src/backends/native/meta-backend-native.h b/src/backends/native/meta-backend-native.h
index 29a9b5c1b6..b389652b2d 100644
--- a/src/backends/native/meta-backend-native.h
+++ b/src/backends/native/meta-backend-native.h
@@ -47,6 +47,4 @@ MetaUdev * meta_backend_native_get_udev (MetaBackendNative *native);
 
 MetaKms * meta_backend_native_get_kms (MetaBackendNative *native);
 
-void meta_backend_native_set_seat_id (const gchar *seat_id);
-
 #endif /* META_BACKEND_NATIVE_H */