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

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>]

    The last of the major userland ABI changes are now in HEAD, along 
    with some propolice bug fixes related to -O2 compiles.

    The DragonFly_Preview tag has been updated.

    Due to the ABI changes, people using Preview or HEAD are going to have
    to recompile everything... kernel, world, ports, etc.

    buildworld
    buildkernel
    installkernel
    [reboot]
    installworld
    [reboot]
    [rebuild ports and other programs]

					-Matt
					Matthew Dillon 
					<dillon@xxxxxxxxxxxxx>