yadif: Re-renable MMX asm on x86_64 with meson
The meson build doesn't automatically set HAVE_CPU_* defines like autotools did, so the yadif plugin was being built without the MMX assembler support
Edited by Jan Schmidt
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The meson build doesn't automatically set HAVE_CPU_* defines like autotools did, so the yadif plugin was being built without the MMX assembler support