Link with -lrt

The newer glibc isn't that common yet.
kike: go with shorter SHA1 fingerprints
ZyklonB: make client certificates actually work

We forgot to set the private key, which can reside in the same file
as the certificate, appended at the end.
ZyklonB: `status' -> use semicolons in output
Silence GCC
Deal better with displaying IPv6 addresses
ZyklonB: add SOCKS 5/4a support