package/nettle: bump version to 3.5.1

Release notes:
http://lists.lysator.liu.se/pipermail/nettle-bugs/2019/007593.html



Removed patch which was applied upstream.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>