configure.ac: check for a recent enough libv4l1.h

[Damjan Jovanovic]

Changelog:
* configure.ac: check for a recent enough libv4l1.h

libv4l1.h can only be used instead of linux/videodev.h as of version
0.8.3, so check for the version using pkg-config (the only possible
way) 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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