FreeBSD/ports 0c15eaf (r512452)multimedia/svt-vp9 distinfo Makefile

multimedia/svt-vp9: update to s20190919

Changes:        https://github.com/OpenVisualCloud/SVT-VP9/compare/e9653d9...68b81bd
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+3-3multimedia/svt-vp9/distinfo
+2-2multimedia/svt-vp9/Makefile
+5-52 files

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