games/vcmi: the port had been updated to version 1.7.1

This is the new major version since 1.6.8 released last
April, with plethora of new features and bug fixes.

We must now #include <sys/param.h> explicitly which was
previously sucked in via, roughly, `boost/thread/*' ->
boost/atomic/*' -> boost/atomic/detail/platform.hpp'.

Reported by: portscout