gallium: track if st_egl_image was created by a dmabuf

This is required by GL_EXT_EGL_image_storage to verify if the image is valid

Signed-off-by: Simon Zeni <simon@bl4ckb0ne.ca>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18673>

src/gallium/frontends/dri/dri_screen.c

@@ -738,6 +738,7 @@ dri_get_egl_image(struct st_manager *smapi,
    stimg->format = map ? map->pipe_format : img->texture->format;
    stimg->level = img->level;
    stimg->layer = img->layer;
+   stimg->imported_dmabuf = img->imported_dmabuf;
 
    if (img->imported_dmabuf && map) {
       /* Guess sized internal format for dma-bufs. Could be used

src/gallium/frontends/wgl/stw_image.c

@@ -140,4 +140,5 @@ stw_translate_image(struct stw_image *in, struct st_egl_image *out)
    out->format = in->format;
    out->layer = in->layer;
    out->level = in->level;
+   out->imported_dmabuf = false;
 }

src/gallium/include/frontend/api.h

@@ -193,6 +193,8 @@ struct st_egl_image
 
    /* one of __DRI_YUV_RANGE_* */
    unsigned yuv_range;
+
+   bool imported_dmabuf;
 };
 
 /**