Use unaligned loads in S16 SSE2 stereo
Use unaligned loads in S16 SSE2 stereo

GCC 4.7 / AMD Phenom II X6 / Linux 3.2: 16% speed increase
Clang 4.0 / Intel Core i5 / OS X 10.8: 26% speed increase

h6ah4i/libfresample,h6ah4i/libfresample,depp/libfresample,depp/libfresample,depp/libfresample