sysklogd: security bump to version 1.5.1

Fixes CVE-2014-3634 - invalid priority values between 192 and 1023
(directly or arrived at via overflow wraparound) can propagate through
code causing out-of-bounds access to the f_pmask array within the
'filed' structure by up to 104 bytes past its end.

Switch to vanilla since Debian hasn't handled this yet and add hash
file.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>