dirent ABI and propolice bug fixes in HEAD, DragonFly_Preview tag updated

[walt]

Matthew Dillon wrote:

    Due to the ABI changes, people using Preview or HEAD are going to have
    to recompile everything... kernel, world, ports, etc.
Just finished the world/kernel upgrade -- and all the ports I've tried
(so far) seem to work just fine without rebuilding.
So, what failure mode should I be looking for in ports which have not
been rebuilt yet?