i965: track if image is created by a dmabuf

Will be used by EXT_EGL_image_storage later.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

src/mesa/drivers/dri/i965/intel_image.h

@@ -89,6 +89,7 @@ struct __DRIimageRec {
    GLuint tile_x;
    GLuint tile_y;
    bool has_depthstencil;
+   bool imported_dmabuf;
 
    /** Offset of the auxiliary compression surface in the bo. */
    uint32_t aux_offset;

src/mesa/drivers/dri/i965/intel_screen.c

@@ -1277,6 +1277,7 @@ intel_create_image_from_dma_bufs2(__DRIscreen *dri_screen,
    image->sample_range = sample_range;
    image->horizontal_siting = horizontal_siting;
    image->vertical_siting = vertical_siting;
+   image->imported_dmabuf = true;
 
    *error = __DRI_IMAGE_ERROR_SUCCESS;
    return image;