glx/dri3: set the implemented version of __DRIimageLoaderExtension

... over the one provided by the spec.
Currently both versions are identical, but that is not
guaranteed to be the case in the future.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/glx/dri3_glx.c

@@ -1307,9 +1307,10 @@ dri3_get_buffers(__DRIdrawable *driDrawable,
 /* The image loader extension record for DRI3
  */
 static const __DRIimageLoaderExtension imageLoaderExtension = {
-   {__DRI_IMAGE_LOADER, __DRI_IMAGE_LOADER_VERSION},
-   .getBuffers = dri3_get_buffers,
-   .flushFrontBuffer = dri3_flush_front_buffer,
+   .base = { __DRI_IMAGE_LOADER, 1 },
+
+   .getBuffers          = dri3_get_buffers,
+   .flushFrontBuffer    = dri3_flush_front_buffer,
 };
 
 /** dri3_swap_buffers