swscale: fix compilation with --enable-runtime-cpudetect
swscale: further cleanup swscale.c
Move x86-specific constants out of swscale.c
swscale: partially move the arch specific code left
PPC and x86 code is split off from swscale_template.c. Lots of code isstill duplicated and should be removed later.
Again uniformize the init system to be more similar to the dsputil one.
Unset h*scale_fast in the x86 init in order to make the output...