o Switch to libtool 1.4.
o Add WITHOUT_IPV6 knob (Requested by Jens Rehsack <email@example.com>
in ports/53754, implemented in a slightly different way).
o Add GIF and animated GIF write support by default in GD and add
WITH_LZW knob to enable the LZW compression algorithm (patented
in some countries).
o Removed gd_gif_out.diff patch and added many new patches.
PR: ports/53754, ports/53879
Requested by: Jens Rehsack <firstname.lastname@example.org>
Submitted by: Alex Dupre <email@example.com> (maintainer)