Problems building with C++ standard library

Source: [AlexApps99/dolphin@lite](https://github.com/AlexApps99/dolphin/tree/lite)
Log: https://gist.github.com/AlexApps99/e229d54423c9173dc5d3fa111e104040#file-log-txt-L317-L451

Trying to port a project to Emscripten, I'm relatively new to it so I'm not really sure why this is failing.
#5435 seemed similar, but I could not identify how to fix based on it.
I also found https://stackoverflow.com/q/58628377, but again, I don't know how it relates to my project.

I am happy to provide further information where needed.