Bugzilla bug #20770: on Solaris, gethost.c needs to link with -lsocket if USE_IPV6=1 is specified.
Bugzilla bug #20770: on Solaris, gethost.c needs to link with -lsocket
if USE_IPV6=1 is specified.

makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub