avformat/img2: Avoid relocations for ff_img_tags
The strings here are so short that using a pointer is wasteful
(the longest string takes nine bytes; on 64 bit systems,
the pointer+padding already take 12 bytes). So avoid them
and add asserts to ensure that no one ever tries to use a too
long tag.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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