Hi, I noticed a problem when building lua 5.2 with LUA_COMPAT_ALL defined. I need to use the "module" function, but it seems to be broken in 5.2? Take this snippet for example:
```
package.preload['sub_module1'] = (function(...)
module("shared_module");
sub_module1 = {}
function sub_module1.add(a, b) return a + b; end
end)
require('sub_module1');
local module_file = _G['shared_module']['sub_module1'];
num = module_file.add(1, 2);
print(num);
```
Running this with lua 5.1 will output `3`. Running this with lua 5.2 will output the following error:
```
./src/lua: ../../sample.lua:11: attempt to index global '_G' (a nil value)
stack traceback:
../../sample.lua:11: in main chunk
[C]: in ?
```
everything appears to get wiped from the global scope, including "_G", "require", "print", etc. It seems to happen in this `set_env` function
https://www.lua.org/source/5.3/loadlib.c.html#set_env when we load the `ll_module` c function. I was able to repro this with the default `make macosx` command and the lua interpreter for 5.1.5 and 5.2.4. Am I missing a required flag here? Is this expected behavior?
