swscale: remove unneeded include assert.h

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_yadif:remove unneeded include assert.h

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
tests/tiny_psnr: remove unneeded include assert.h

This is the only such occurance on tests/

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/softfloat: remove unneeded include assert.h

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>