fontforge: update to 20150824

* LICENSE was rewrittem stating out more clearly that huge parts were initially
  licensed under BSD clause 3 - so add that licence.
* Follow suggestion not to use github release tarballs [1] and use git as
  source.

[1] http://lists.openembedded.org/pipermail/openembedded-devel/2015-August/102843.html



Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>