LIBGD:  Revert back to self-hosting of libgd
LIBGD:  Revert back to self-hosting of libgd

Version from https://github.com/libgd/libgd/archive/gd-2.1.1.tar.gz
doesn't ship configure script, and requires bootstrapping or the use
of autoreconf -f -i. This requires a lot of Perl packages and hinders
easy build on CYGWIN. Until fixed by upstream we'll self-host it.

VincentToups/lambdanative,VincentToups/lambdanative,emacstheviking/lambdanative,VincentToups/lambdanative,emacstheviking/lambdanative,emacstheviking/lambdanative,emacstheviking/lambdanative,emacstheviking/lambdanative,VincentToups/lambdanative,VincentToups/lambdanative