[mutter] cogl: Remove unused COGL_FEATURE_TEXTURE_READ_PIXELS

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

commit f01db803874871b01a09a6d4a81029902e1b627b
Author: Adam Jackson <ajax redhat com>
Date:   Thu Oct 17 21:02:23 2019 -0400

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

 cogl/cogl/cogl-types.h                  | 2 --
 cogl/cogl/driver/gl/gl/cogl-driver-gl.c | 1 -
 2 files changed, 3 deletions(-)
---
diff --git a/cogl/cogl/cogl-types.h b/cogl/cogl/cogl-types.h
index e663f8b08..8d1c1bcfd 100644
--- a/cogl/cogl/cogl-types.h
+++ b/cogl/cogl/cogl-types.h
@@ -113,7 +113,6 @@ typedef struct _CoglTextureVertex       CoglTextureVertex;
 /**
  * CoglFeatureFlags:
  * @COGL_FEATURE_TEXTURE_YUV: ycbcr conversion support
- * @COGL_FEATURE_TEXTURE_READ_PIXELS: glReadPixels() support
  * @COGL_FEATURE_PBOS: PBO support
  *
  * Flags for the supported features.
@@ -123,7 +122,6 @@ typedef struct _CoglTextureVertex       CoglTextureVertex;
 typedef enum
 {
   COGL_FEATURE_TEXTURE_YUV            = (1 << 3),
-  COGL_FEATURE_TEXTURE_READ_PIXELS    = (1 << 4),
   COGL_FEATURE_PBOS                  = (1 << 12),
 } CoglFeatureFlags;
 
diff --git a/cogl/cogl/driver/gl/gl/cogl-driver-gl.c b/cogl/cogl/driver/gl/gl/cogl-driver-gl.c
index c399fa9aa..069346a60 100644
--- a/cogl/cogl/driver/gl/gl/cogl-driver-gl.c
+++ b/cogl/cogl/driver/gl/gl/cogl-driver-gl.c
@@ -393,7 +393,6 @@ _cogl_driver_update_features (CoglContext *ctx,
                                   &ctx->glsl_major,
                                   &ctx->glsl_minor);
 
-  flags = (COGL_FEATURE_TEXTURE_READ_PIXELS);
   COGL_FLAGS_SET (ctx->features,
                   COGL_FEATURE_ID_UNSIGNED_INT_INDICES, TRUE);