osdep: Define lsmash_{fseek|ftell} as _{fseek|ftell}i64 for MSVC.
osdep: Define lsmash_{fseek|ftell} as _{fseek|ftell}i64 for MSVC.

silverfilain/L-SMASH,l-smash/l-smash,dwbuiten/l-smash,canbal/l-smash,canbal/l-smash,dwbuiten/l-smash,l-smash/l-smash,l-smash/l-smash,maki-rxrz/L-SMASH,silverfilain/L-SMASH,silverfilain/L-SMASH,maki-rxrz/L-SMASH