ARC4RANDOM: unused old function withdrawal to get rid of cc warning...

(cherry picked from commit 0327eda066954458d3b8501710ea1f2461d3b0a9)
Signed-off-by: Oliver Pinter <oliver.pinter@hardenedbsd.org>
ARC4RANDOM: update of the licence.

(cherry picked from commit 679fdf62d173ef8d2b92ff8d7b767fc1977c894b)
Signed-off-by: Oliver Pinter <oliver.pinter@hardenedbsd.org>