GETENTROPY: Withdraw syscall version, replaced by KERN_ARND sysctl wrapper.

Signed-off-by: Shawn Webb <lattera@gmail.com>
SECOND PART: updates of timingsafe* functions + getentropy

Signed-off-by: Shawn Webb <lattera@gmail.com>
GETENTROPY: forgotten file.
GETENTROPY: deduplicate getentropy symbol
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/userlandenhanced
Merge remote-tracking branch 'origin/hardened/current/userlandenhanced' into hardened/current/unstable