openssh-3.8p1 fails to set TZ environment variable bug

[Craig Ruff]

Found on while running on IRIX 6.5.22f, sshd from openssh-3.8p1 nukes 
its envrionment in main(), causing sshd to loose track of the TZ 
environment variable passed to it by the system.  This means that inside 
do_setup_env(), the call to getenv("TZ") will never succeed, despite the 
fact that this variable should have a value.