* Revert https://chromium-review.googlesource.com/c/chromium/src/+/570351
which assumes that x86 must have SSE (1).
* Fix the wsola_internals.cc patch: xmmintrin.h requires only SSE (1),
not SSE2. (Should not really make a difference in practice though.)
* Fix rebasing copy&paste error in DirectConvolver.cpp.