[COMPILER REQUEST]: Cosmopolitan C/C++ compiler

[partouf]

Compiler name

Cosmopolitan

Compiler version

x86-64 any

Compiler language

C, C++

Compiler homepage

https://github.com/jart/cosmopolitan

Motivation

I think the "compiler" has been added within the last 2 years, before that it was quite complicated to run afaik.
But as it now includes its own compiler, it should be fairly easy to add to CE.
I'm not sure what the output would be, but I suspect it's either unreadable or the exact same as any other gcc compiler. But would be good to showcase either way.