Fix no-sse2 patch bugs
    
    * 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.