Merge tzdata2014f.

The following new time zones are added:
    Asia/Chita Asia/Srednekolymsk
The following new file is installed:
    zone1970.tab
The following existing file is now installed, whereas we previously
did not install it:
    leapseconds
New files that appeared in tzdata2014f, plus the
leapseconds file that has existed for a long time
but was not installed before today.
tzcode2014f/tzdata2014f has been released.  We have updated tzdata.
zoneinfo: Import tzdata2014f. [apb 20140806]
Update tzdata2netbsd for tzdata2014f.
Consistently define WARN in a way that passes format string checks, i.e.
always uses the same number of arguments as given in the format string.
radeon_fence_signaled needs to take the fence lock.
provide a setmode callback for genfb; with this change, vt switching in and out of X works
remove KASSERT(nam != NULL) from ddp_send() the following code makes
the validity of it questionable.  we'll investigate later whether it
can be put back and the code simplified.
simplify wpi_rx_intr rbuf handling and add some more bus_dmamap_sync; fixes stalls when downloading large files for me
Use NULL instead of 0 for pointers