package/libcue: update upstream URL

According to http://sourceforge.net/projects/libcue

 the project moved
to github.com, all source tarballs were removed from Sourceforge.

Adjust project and download URLs, update hash and remove
0001-_unused-fix.patch because there is no trace of "__unused" in the
upstream tarball anymore, the patch fails to apply.

Add autoreconf because the new upstream tarball does not contain a
configure script, autoreconf also needs a tweak because it fails when
config/ is not present.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>