Fixes for cargo publish (#1416)

* Publishing fixes.

* Make WASI a symlink.

* More fixes.

* Cargo doesn't allow dev-dependencies to have optional features.

* Remove the symlink.

* Add WASI as another git submodule.

crates/wasi-common/Cargo.toml

@@ -9,6 +9,7 @@ keywords = ["webassembly", "wasm"]
 repository = "https://github.com/bytecodealliance/wasmtime"
 readme = "README.md"
 edition = "2018"
+include = ["src/**/*", "LICENSE", "WASI/phases"]
 
 [dependencies]
 anyhow = "1.0"

crates/wasi-common/README.md

@@ -60,10 +60,10 @@ rustup target add wasm32-wasi
 [rustup]: https://rustup.rs
 
 Now, you should be able to run the integration testsuite by running `cargo test` on the
-`test-programs` package with `test_programs` feature enabled:
+`test-programs` package with `test-programs/test_programs` feature enabled:
 
 ```
-cargo test --features test_programs --package test-programs
+cargo test --features test-programs/test_programs --package test-programs
 ```
 
 ## Third-Party Code

crates/wasi-common/src/wasi.rs

@@ -4,7 +4,7 @@
 use crate::WasiCtx;
 
 wiggle::from_witx!({
-    witx: ["wig/WASI/phases/snapshot/witx/wasi_snapshot_preview1.witx"],
+    witx: ["WASI/phases/snapshot/witx/wasi_snapshot_preview1.witx"],
     ctx: WasiCtx,
 });