Bump autoconf version
Bump autoconf version

Oops, forgot this one. This is only important for building distfiles
though, so I won't bother with another release tag.

mwgoldsmith/libass,libass/libass,richardpl/libass,stps/libass,xbmc/libass,grigorig/libass,pigoz/libass-ct,Akemi/libass,libass/libass,astiob/libass,MrSmile/libass,vault/libass,asimonov-im/libass,ShiftMediaProject/libass,torque/libass,astiob/libass,Distrotech/libass,sanyaade-g2g-repos/libass,richardpl/libass,pigoz/libass-ct,rhlee/libass,tgoyne/libass,torque/libass,sanyaade-g2g-repos/libass,richardpl/libass,blinkseb/libass,Distrotech/libass,Akemi/libass,MrSmile/libass,stps/libass,rhlee/libass,grigorig/libass,pigoz/libass-ct,asimonov-im/libass,ShiftMediaProject/libass,Akemi/libass,Distrotech/libass,sanyaade-g2g-repos/libass,vault/libass,tgoyne/libass,rhlee/libass,mwgoldsmith/libass,tgoyne/libass,xbmc/libass,stps/libass,blinkseb/libass,mwgoldsmith/libass,blinkseb/libass,torque/libass