intel: remove unused RenderToTexture field

src/mesa/drivers/dri/intel/intel_fbo.c

@@ -481,8 +481,6 @@ intel_update_wrapper(GLcontext *ctx, struct intel_renderbuffer *irb,
    irb->Base.Delete = intel_delete_renderbuffer;
    irb->Base.AllocStorage = intel_nop_alloc_storage;
 
-   irb->RenderToTexture = GL_TRUE;
-
    return GL_TRUE;
 }
 

src/mesa/drivers/dri/intel/intel_fbo.h

@@ -55,15 +55,11 @@ struct intel_framebuffer
 
 /**
  * Intel renderbuffer, derived from gl_renderbuffer.
- * Note: The PairedDepth and PairedStencil fields use renderbuffer IDs,
- * not pointers because in some circumstances a deleted renderbuffer could
- * result in a dangling pointer here.
  */
 struct intel_renderbuffer
 {
    struct gl_renderbuffer Base;
    struct intel_region *region;
-   GLboolean RenderToTexture;   /* RTT? */
 
    GLuint vbl_pending;   /**< vblank sequence number of pending flip */