no-sse2.patch: remove -ffloat-store, fix DirectConvolver FTBFS
    
    * Remove the -ffloat-store workaround: The media player issue that
      caused problems with x87 floating point (and ultimately made upstream
      require SSE2) should already be fixed / worked around by:
      https://crrev.com/d2c745b13c93ecff5108bed57d8e052126715492
      So I will only readd -ffloat-store if people request it, and even
      then, only to specific parts of code and not everything.
    * Fix src/3rdparty/chromium/third_party/WebKit/Source/platform/audio/
      DirectConvolver.cpp to not require SSE2 on x86. (No runtime detection,
      sorry.)
    * Update the changelog date in the specfile.