lls/x86: use 3-operator vaddpd in ADDPD_MEM

Fixes build with yasm-1.1

Signed-off-by: Anton Khirnov <anton@khirnov.net>
oggdec: do not fall back on binary search in the generic code.

Binary search is already attempted in the format-specific seek function,
so the fallback is only reached if binary search failed already.