Bug#1050632: vlc: Downgrade to lua5.1

[Bastian Germann]

Source: vlc
Severity: wishlist
Version: 3.0.18-4

Please build your package with lua5.1 so we can drop v5.2 from the archive.
The build system supports it as fallback but you can certainly also try 
patching to a more up to date lua version.