[mutter] wayland/dma-buf: Fix building without native backend

[Robert Mader <rmader src gnome org>]

commit 32affbf05a70ddf3fdbb9f088747811217cf4334
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Aug 6 16:18:17 2021 +0200

    wayland/dma-buf: Fix building without native backend
    
    The usefullnes of Wayland without the native backend is questionable,
    but since it's theoretically possible, make it at least compile again.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2202>

 src/wayland/meta-wayland-dma-buf.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/wayland/meta-wayland-dma-buf.c b/src/wayland/meta-wayland-dma-buf.c
index c4081db426..8108d614f2 100644
--- a/src/wayland/meta-wayland-dma-buf.c
+++ b/src/wayland/meta-wayland-dma-buf.c
@@ -98,7 +98,9 @@ meta_wayland_dma_buf_realize_texture (MetaWaylandBuffer  *buffer,
   EGLImageKHR egl_image;
   CoglEglImageFlags flags;
   CoglTexture2D *texture;
+#ifdef HAVE_NATIVE_BACKEND
   MetaDrmFormatBuf format_buf;
+#endif
 
   if (buffer->dma_buf.texture)
     return TRUE;
@@ -158,11 +160,13 @@ meta_wayland_dma_buf_realize_texture (MetaWaylandBuffer  *buffer,
       return FALSE;
     }
 
+#ifdef HAVE_NATIVE_BACKEND
   meta_topic (META_DEBUG_WAYLAND,
               "[dma-buf] wl_buffer@%u DRM format %s -> CoglPixelFormat %s",
               wl_resource_get_id (meta_wayland_buffer_get_resource (buffer)),
               meta_drm_format_to_string (&format_buf, dma_buf->drm_format),
               cogl_pixel_format_to_string (cogl_format));
+#endif
 
   for (n_planes = 0; n_planes < META_WAYLAND_DMA_BUF_MAX_FDS; n_planes++)
     {