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Add libcamera support

Dan Scally requested to merge showcases/embedded-world-2023/pkg/compression:djrscally/embeddedworld2023 into electronica2022/main

This PR adds libcamera support to the compression program; V4L2 support isn't retained (though the source files are still there). Libcamera itself is required:

git clone https://git.libcamera.org/libcamera/libcamera.git
cd libcamera
meson setup build
ninja -C build install

Once built, running ./compression should just pick up the first camera libcamera sees. By default it will run at its highest resolution; you can dial it down by passing a framesize, for example ./compression -s 1280x720

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