Run seektest on all generated files

Makefile

tests/ref/seek/ac3.rm.ref

tests/ref/seek/adpcm_ima.wav.ref

tests/ref/seek/adpcm_ms.wav.ref

tests/ref/seek/adpcm_qt.aiff.ref

tests/ref/seek/adpcm_swf.flv.ref

tests/ref/seek/adpcm_yam.wav.ref

tests/ref/seek/alac.m4a.ref

tests/ref/seek/asv1.avi.ref

tests/ref/seek/asv2.avi.ref

tests/ref/seek/dnxhd-1080i.mov.ref

tests/ref/seek/dnxhd-720p-rd.dnxhd.ref

tests/ref/seek/dnxhd-720p.dnxhd.ref

tests/ref/seek/dv.dv.ref

tests/ref/seek/dv411.dv.ref

tests/ref/seek/dv50.dv.ref

tests/ref/seek/error-mpeg4-adv.avi.ref

tests/ref/seek/ffv1.avi.ref

tests/ref/seek/flac.flac.ref

tests/ref/seek/flashsv.flv.ref