Disable loading of binary chunks in Lua

[pmatilai]

Quoting the Lua manual:

It is safe to load malformed binary chunks; load signals an appropriate error. However, Lua does not check the consistency of the code inside binary chunks; running maliciously crafted bytecode can crash the interpreter.

...and interpreter in our case is the rpm main process.

I don't know whether it's possible to stick a binary Lua chunk into one of our scriptlets in the header as such to get rpm to directly run it, but the Lua load() in our embedded environment is unrestricted. And rpm's own runner uses luaL_loadbuffer() which doesn't discriminate...