gd: added upstream license file and fixed configure warnings

This fixes QA warnings about missing license file and stale configure options,
(includes updates for freetype libpath and disables hardcoded rpaths).

Upstream-Status: Inappropriate (distribution/packaging fix)

Signed-off-by: Stephen Arnold <stephen.arnold42@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>