Compiles

[lukaso]

Got this compiling on Clang 13. I've not tested that it works, however.

I used these instructions to get it compiling:

EOSIO/eos#43:

With brew, make sure you have llvm 13 installed

$ brew info llvm  
llvm: stable 13.0.0 (bottled), HEAD [keg-only]
Next-gen compiler infrastructure
https://llvm.org/
/usr/local/Cellar/llvm/13.0.0_2 (5,449 files, 940.8MB)

And let cmake know where to find cmake files for llvm:

export LLVM_DIR=/usr/local/Cellar/llvm/13.0.0_2/lib/cmake