Log Message:
multimedia/dav1d: Update to 1.5.0

Changelog:
Changes for 1.5.0 'Sonic':
--------------------------

1.5.0 is a major release of dav1d, that:
 - WARNING: we removed some of the SSE2 optimizations, so if you care about
            systems without SSSE3, you should be careful when updating!
 - Add Arm OpenBSD run-time CPU feature
 - Optimize index offset calculations for decode_coefs
 - picture: copy HDR10+ and T35 metadata only to visible frames
 - SSSE3 new optimizations for 6-tap (8bit and hbd)
 - AArch64/SVE: Add HBD subpel filters using 128-bit SVE2
 - AArch64: Add USMMLA implempentation for 6-tap H/HV
 - AArch64: Optimize Armv8.0 NEON for HBD horizontal filters and 6-tap filters
 - Power9: Optimized ITX till 16x4.
 - Loongarch: numerous optimizations
 - RISC-V optimizations for pal, cdef_filter, ipred, mc_blend, mc_bdir, itx
 - Allow playing videos in full-screen mode in dav1dplay