dict: const pointers to dictionary where possible
This avoids temporaries or ugly casting in the calling code where const dictionaries are used. Esp. helpful when writing C++ wrappers for an AVDictionary having const member functions and CTORs with const references. Signed-off-by: NRoman Fietze <roman.fietze@telemotive.de> Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>
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