Absolute `global_env_def` paths don't work

[uramer]

Using a global path for that setting produces an error: Error: could not predefine module

This is quite inconvenient, as it's common for the Lua environment (e. g. a game engine) to redefine the global environment, rather than for the particular script to do it.

[uramer]

Nevermind, it looks for any directories in include_dir