configure: look for luac as a (potential) cross-tool
configure: look for luac as a (potential) cross-tool

This is the bulldozer approach to precompiling Lua to different
architectures.

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc