[mutter] cogl: Fix a few GISCAN warnings

[Jonas Ådahl <jadahl src gnome org>]

commit c55943d7534ca969d563160e9f419f8a863ec01b
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Aug 4 23:03:32 2016 +0800

    cogl: Fix a few GISCAN warnings
    
    We tried to resolve non-introspected types; lets skip those. We didn't
    have a vfunc scope on a for-each loop; declared it synchronous.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769800

 cogl/cogl/cogl-xlib-renderer.h              |    2 +-
 cogl/cogl/deprecated/cogl-material-compat.h |    8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/cogl/cogl/cogl-xlib-renderer.h b/cogl/cogl/cogl-xlib-renderer.h
index 04811b4..f3c1d7c 100644
--- a/cogl/cogl/cogl-xlib-renderer.h
+++ b/cogl/cogl/cogl-xlib-renderer.h
@@ -180,7 +180,7 @@ XVisualInfo *
 cogl_xlib_renderer_get_visual_info (CoglRenderer *renderer);
 
 /**
- * cogl_xlib_renderer_request_reset_on_video_memory_purge:
+ * cogl_xlib_renderer_request_reset_on_video_memory_purge: (skip)
  * @renderer: a #CoglRenderer
  * @enable: The new value
  *
diff --git a/cogl/cogl/deprecated/cogl-material-compat.h b/cogl/cogl/deprecated/cogl-material-compat.h
index d046f45..97f3e9c 100644
--- a/cogl/cogl/deprecated/cogl-material-compat.h
+++ b/cogl/cogl/deprecated/cogl-material-compat.h
@@ -1307,7 +1307,7 @@ CoglMaterialWrapMode
 cogl_material_layer_get_wrap_mode_p (CoglMaterialLayer *layer);
 
 /**
- * cogl_material_set_depth_state:
+ * cogl_material_set_depth_state: (skip)
  * @material: A #CoglMaterial object
  * @state: A #CoglDepthState struct
  * @error: A #CoglError to report failures to setup the given @state.
@@ -1334,7 +1334,7 @@ cogl_material_set_depth_state (CoglMaterial *material,
                                CoglError **error);
 
 /**
- * cogl_material_get_depth_state:
+ * cogl_material_get_depth_state: (skip)
  * @material: A #CoglMaterial object
  * @state_out: A destination #CoglDepthState struct
  *
@@ -1370,8 +1370,8 @@ typedef CoglBool (*CoglMaterialLayerCallback) (CoglMaterial *material,
 /**
  * cogl_material_foreach_layer:
  * @material: A #CoglMaterial object
- * @callback: A #CoglMaterialLayerCallback to be called for each layer
- *            index
+ * @callback: (scope call): A #CoglMaterialLayerCallback to be called for each
+ *            layer index
  * @user_data: Private data that will be passed to the callback
  *
  * Iterates all the layer indices of the given @material.