Move cranelift dependencies to wasmtime-environ (#669)

Groups all CL data structures into single dependency to be used accross wasmtime project.

crates/test-programs/tests/wasm_tests/runtime.rs

@@ -1,8 +1,8 @@
 use anyhow::{bail, Context};
-use cranelift_codegen::settings::{self, Configurable};
 use std::fs::File;
 use std::{collections::HashMap, path::Path};
 use wasmtime::{Config, Engine, HostRef, Instance, Module, Store};
+use wasmtime_environ::settings::{self, Configurable};
 
 pub fn instantiate(data: &[u8], bin_name: &str, workspace: Option<&Path>) -> anyhow::Result<()> {
     // Prepare runtime