Header files move

[Steve O'Hara-Smith]

	Hi,

	A little bird tells me that the bt848_ioctl.h and meteor_ioctl.h
files have moved in 5.<mumble> from machine/ to dev/bktr/. ISTM that
I should update the grab code in ffmpeg and nuppelvideo with changed
includes wrapped in something like:

#if __FreeBSD__ > mumble
new style
#else
old style
#endif

	Can anyone give me an appropriate value for "mumble" in this
please ? My guess is 520000.

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