[mutter] cogl: Remove unused COGL_FEATURE_ONSCREEN_MULTIPLE

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 3076895e983cf578327f2f6ad4e0ae9f2f681623
Author: Adam Jackson <ajax redhat com>
Date:   Thu Oct 17 19:49:12 2019 -0400

    cogl: Remove unused COGL_FEATURE_ONSCREEN_MULTIPLE
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/866

 cogl/cogl/cogl-types.h                 | 1 -
 cogl/cogl/winsys/cogl-winsys-egl-x11.c | 1 -
 cogl/cogl/winsys/cogl-winsys-glx.c     | 1 -
 3 files changed, 3 deletions(-)
---
diff --git a/cogl/cogl/cogl-types.h b/cogl/cogl/cogl-types.h
index 4da55dad0..28a0b78aa 100644
--- a/cogl/cogl/cogl-types.h
+++ b/cogl/cogl/cogl-types.h
@@ -141,7 +141,6 @@ typedef enum
   COGL_FEATURE_UNSIGNED_INT_INDICES   = (1 << 13),
   COGL_FEATURE_MAP_BUFFER_FOR_READ    = (1 << 21),
   COGL_FEATURE_MAP_BUFFER_FOR_WRITE   = (1 << 22),
-  COGL_FEATURE_ONSCREEN_MULTIPLE      = (1 << 23),
 } CoglFeatureFlags;
 
 /**
diff --git a/cogl/cogl/winsys/cogl-winsys-egl-x11.c b/cogl/cogl/winsys/cogl-winsys-egl-x11.c
index 449a31f4b..194fc15a8 100644
--- a/cogl/cogl/winsys/cogl-winsys-egl-x11.c
+++ b/cogl/cogl/winsys/cogl-winsys-egl-x11.c
@@ -387,7 +387,6 @@ _cogl_winsys_egl_context_init (CoglContext *context,
                                  event_filter_cb,
                                  context);
 
-  context->feature_flags |= COGL_FEATURE_ONSCREEN_MULTIPLE;
   COGL_FLAGS_SET (context->features,
                   COGL_FEATURE_ID_ONSCREEN_MULTIPLE, TRUE);
   COGL_FLAGS_SET (context->winsys_features,
diff --git a/cogl/cogl/winsys/cogl-winsys-glx.c b/cogl/cogl/winsys/cogl-winsys-glx.c
index 068316ac4..b36d3ef57 100644
--- a/cogl/cogl/winsys/cogl-winsys-glx.c
+++ b/cogl/cogl/winsys/cogl-winsys-glx.c
@@ -832,7 +832,6 @@ update_winsys_features (CoglContext *context, GError **error)
 
   context->feature_flags |= glx_renderer->legacy_feature_flags;
 
-  context->feature_flags |= COGL_FEATURE_ONSCREEN_MULTIPLE;
   COGL_FLAGS_SET (context->features,
                   COGL_FEATURE_ID_ONSCREEN_MULTIPLE, TRUE);