opencv: Only enable 'libav' support if commercial license is whitelisted
opencv: Only enable 'libav' support if commercial license is whitelisted

The libav support requires the commercial license to be
whitelist. This makes opencv to work in non-commercial setups without
needing to change the PACKAGECONFIG settings manually.

Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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