lavfi/tonemap: make use of AVFILTER_DEFINE_CLASS
use AVFILTER_DEFINE_CLASS for defining the filter classes
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
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use AVFILTER_DEFINE_CLASS for defining the filter classes
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>