Using the Compiler lib without needing the devel version of Nim

[ElegantBeef]

You do not need `devel` though it depends on the version you're targeting and 
what you're doing, personally for Nimscripter I just add do `--path:"$nim"` or 
the equivalent to use the compiler API of their current compiler, this makes it 
less annoying and does not have a weird dependency.