fftools: fix hwaccels option dump redundancy
When QSV is enabled in FFmpeg, the command "ffmpeg -hwaccels" shows a duplicate entry in acceleration methods for QSV: Hardware acceleration methods: vaapi qsv drm opencl qsv Reviewed-by: Mark Thompson <sw@jkqxz.net> Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
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