fix gcc flag for SSE2 support, latest gcc 4.4 requires sse2 to be enabled explicitly
fix gcc flag for SSE2 support,
latest gcc 4.4 requires sse2 to be enabled explicitly

mbechard/libsquish,robhshu/libsquish,hlhtddx/libsquish,siavee/libsquish,zjhlogo/libsquish,milkysunshine91/libsquish,zjhlogo/libsquish,mycheckgithub/libsquish,derekbradley/libsquish,cococo111111/libsquish,mantheman/libsquish,zjhlogo/libsquish,mbechard/libsquish,DustinGuoSZ/libsquish,mycheckgithub/libsquish,DustinGuoSZ/libsquish,cococo111111/libsquish,milkysunshine91/libsquish,mbechard/libsquish,derekbradley/libsquish,robhshu/libsquish,mantheman/libsquish,robhshu/libsquish,siavee/libsquish,siavee/libsquish,mycheckgithub/libsquish,derekbradley/libsquish,cococo111111/libsquish,mantheman/libsquish,hlhtddx/libsquish,milkysunshine91/libsquish,siavee/libsquish,hlhtddx/libsquish,DustinGuoSZ/libsquish