lualoader: Remove debug function

lualoader: Remove debug function

Our module bits ended up more stable than I anticipated, so this turns out
to be no longer useful.

If things like this need to come back, we should do it in a separate 'debug'
module to serve as a collection of debugging aides. As a rule, this 'debug'
module would *not* be allowed as a requirement of any other modules in-tree.