lib/randutils: re-licensing back to BSD

lib/randutils: re-licensing back to BSD

The file is originally from libuuid, this library is under BSD
licence. Unfortunately, I have added LGPL header by accident to the
file (commit 0f23ee0c855d686b0c315af2c96b8835134cd9e3).

The file under LGPL was modified (in relevant way) by Sami,
Christopher and me. We all agree with re-licensing back to BSD.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
Signed-off-by: Christopher James Halse Rogers <chris@cooperteam.net>
Signed-off-by: Karel Zak <kzak@redhat.com>