[FFmpeg-devel] [PATCH] Stricter const prototypes for sws_scale_*

[Alexis Ballier]

Since src[x] isn't modified either, this doesn't harm and it is imho
cleaner to declare the functions with the strictest prototype
possible.
As a side effect (that you probably couldn't care less), this fixes
backward compatibilty for calling sws_scale from c++ as it doesn't
allow converting ** to const ** but wants const* const*

Alexis.
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