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Undefined references to qsv_device and qsv_init

Trying to build with meson (as part of gst-build) gives the following errors:

/usr/bin/ld: subprojects/FFmpeg/8354f14@@ffmpeg@exe/fftools_ffmpeg_opt.c.o:(.data.rel.ro+0x1ba0): undefined reference to `qsv_device'
/usr/bin/ld: subprojects/FFmpeg/8354f14@@ffmpeg@exe/fftools_ffmpeg_opt.c.o:(.data.rel.ro+0x1c48): undefined reference to `qsv_init'
collect2: error: ld returned 1 exit status

It seems that fftools/meson.build doesn't include the ffmpeg_qsv.c file while the original Makefile does include it, which would explain the missing reference.

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