Merge from vendor branch TNF:

Merge from vendor branch TNF:
Third time luck import of a ski emulator package.

Based on the pkg found at

http://cherry.beevomit.org/downloads/netbsd-anvil/pkgsrc.emulators.hp-ski.tar.gz

The Ski simulator is a software package designed to functionally
simulate the IA-64 processor architecture at the instruction level.
Ski offers an informative, screen-oriented machine-state display and a
friendly, powerful command-line interface. Programs may be loaded from
disk in executable format; they may be run from start to finish, single-
stepped, and break-pointed. Execution can occur in a text-oriented or
a graphical user interface or in batch-mode, with no user-interface at
all. Both the user-level and the system-level machine-state can be
simulated. For user-level execution, Ski will intercept IA-64 Linux
system calls and translate them into the corresponding system calls of
the host operating system.