[MPlayer-dev-eng] [Patch] Runtime cpu detection bug fix

Hi The current runtime cpu detection code in configure sets -march to something the processor the configure script is running on would like. However the executables produced with, for example, gcc -march=i686 won't work on older processors. The current configure don't force compilation of mmx, sse etc if runtime cpu detection is used. The patch fixes that too. / Fredrik Kuivinen