Ruby Loader Thread Safety

[viferga]

After testing with NodeJS Port it seems that Ruby loader does not work properly, it needs to be thread safe. There are some workarounds to make it run. All of the have been commented in rb_loader_impl.c file.

A new branch has been created for it: https://github.com/metacall/core/tree/hotfix/ruby-loader-thread-safe

[viferga]

I am not sure if that is the best way of handle threading, by the way I am going to leave this open. Here is more doc: https://silverhammermba.github.io/emberb/c/#threading