Fixes for 0.15 (#1449)

* Wasmtime 0.15.0 and Cranelift 0.62.0. (#1398)

* Bump more ad-hoc versions.

* Add build.rs to wasi-common's Cargo.toml.

* Update the env var name in more places.

* Remove a redundant echo.

crates/lightbeam/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lightbeam"
-version = "0.14.0"
+version = "0.15.0"
 authors = ["The Lightbeam Project Developers"]
 description = "An optimising one-pass streaming compiler for WebAssembly"
 license = "Apache-2.0 WITH LLVM-exception"
@@ -19,7 +19,7 @@ memoffset = "0.5.3"
 itertools = "0.8.2"
 capstone = "0.6.0"
 thiserror = "1.0.9"
-cranelift-codegen = { path = "../../cranelift/codegen", version = "0.61.0" }
+cranelift-codegen = { path = "../../cranelift/codegen", version = "0.62.0" }
 multi_mut = "0.1"
 either = "1.5"
 typemap = "0.3"