It now uses rsvg_handle_get_geometry_for_layer() instead of
rsvg_handle_get_(position|dimensions)_sub() which have been deprecated
in favor of the new function which returns accurate (double) positioning
and size.
Back when I first made this build tool, librsvg had several blocking
bugs to make icon extraction work properly. This seems to improve
nicely.
Nevertheless I still don't build this tool because after testing, more
bugs remain and icon extraction is still not right. Just updating the
code to undeprecate it but leave the build commented out for now. ;-(
See librsvg#134, librsvg#128 and librsvg#250 for bug reports following
these issues.