Simplify hash function
Simplify hash function

We can rely on fast multiplication and good compilers.

v2: use default FNV-1a prime

Signed-off-by: wm4 <af2b84f09c8719e0f2b649c9464c0e4e09337b2e@nowhere>
Signed-off-by: Grigori Goronzy <79e2475f81a6317276bf7cbb3958b20d289b78df@chown.ath.cx>

pigoz/libass-ct,ShiftMediaProject/libass,sanyaade-g2g-repos/libass,grigorig/libass,torque/libass,stps/libass,astiob/libass,grigorig/libass,Akemi/libass,libass/libass,stps/libass,mwgoldsmith/libass,astiob/libass,mwgoldsmith/libass,Akemi/libass,torque/libass,MrSmile/libass,pigoz/libass-ct,pigoz/libass-ct,xbmc/libass,Akemi/libass,xbmc/libass,stps/libass,sanyaade-g2g-repos/libass,MrSmile/libass,torque/libass,mwgoldsmith/libass,sanyaade-g2g-repos/libass,ShiftMediaProject/libass,libass/libass