logger: make posix dep optional, only with syslog
logger: make posix dep optional, only with syslog

Netsend/persdb,Netsend/PerspectiveDB,Netsend/PerspectiveDB,Netsend/mastersync,Netsend/mastersync,Netsend/persdb,Netsend/PerspectiveDB,Netsend/mastersync,Netsend/persdb