multimedia/vvdec: fix build on powerpc64le

/wrkdirs/usr/ports/multimedia/vvdec/work/vvdec-2.1.0/source/Lib/CommonLib/x86/sse41/../BufferX86.h:1041:6: error: loop not vectorized: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering [-Werror,-Wpass-failed=transform-warning]