Log Message:
putty: update to 0.68

PuTTY 0.68, released today, supports elliptic-curve cryptography for host
keys, user authentication keys, and key exchange. Also, for the first time,
it comes in a 64-bit Windows version.

This update may create a build issue for non-BSD due to ancient functions
being different on BSD and SYSV. there's always macros if this fails.