allow declaring a function as part of ASnative
allow declaring a function as part of ASnative

These functions must take 0 minimum args (so do the args check themselves),
and they must not be static.

mltframework/swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,mltframework/swfdec