configure.ac: check for a good enough version of libv4l1.h (try 2)

[Damjan Jovanovic]

Changelog:
* configure.ac: check for a good enough version of libv4l1.h

libv4l1.h can only be used instead of linux/videodev.h on recent versions
(>= 0.8.3), so check for struct video_picture and don't try to compile
with older versions.
This fixes compilation on systems like FreeBSD 8.2, where there is no
linux/videodev.h, and libv4l1.h is too old.

Does not regenerate configure.

Damjan Jovanovic
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