add new dependencies for vagrant 2.0.4 (and their dependencies, too)

devel/rubygem-ffi-win32-extensions
sysutils/rubygem-win32-file
sysutils/rubygem-win32-file-security
sysutils/rubygem-win32-file-stat

These ports don't look like they require special attention, so
just put them into the big ruby pool.