alpha/idctdsp: move idct init code out of dsputil

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/segment: remove gettimeofday() use, remove sys/time.h

It causes portability issues, and would need ifdef hell if its kept

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