In other words, 64-bits platform will support 32-bits LUAC files and
reject 64-bits LUAC files when using contribs.
This should ease cross-compilation and copying luac files manually.
(cherry picked from commit 01ec2d6e8c9347a0c8fec3db0937ef786a97910e)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>