Reinclude the c source via a submodule

Author: Veykril

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "wasm3-sys/wasm3"]
+	path = wasm3-sys/wasm3
+	url = https://github.com/wasm3/wasm3

README.md

@@ -1,6 +1,6 @@
-# wasm3-rs 
+# wasm3-rs
 
-![Build](https://github.com/Veykril/wasm3-rs/workflows/Rust/badge.svg?branch=master) ![Tokei](https://tokei.rs/b1/github/veykril/wasm3-rs)
+![Build](https://github.com/wasm3/wasm3-rs/workflows/Rust/badge.svg?branch=master) ![Tokei](https://tokei.rs/b1/github/wasm3/wasm3-rs)
 [![Crates.io](https://img.shields.io/crates/v/wasm3.svg)](https://crates.io/crates/wasm3)
 [![Docs.rs](https://docs.rs/wasm3/badge.svg)](https://docs.rs/wasm3)
 
@@ -39,6 +39,13 @@ fn main() {
 This crate currently does not make use of the cmake project of wasm3, meaning cmake is not required to built this for the time being.
 It does however require [Clang 9](https://releases.llvm.org/download.html#9.0.0) to be installed as well as [Bindgen](https://github.com/rust-lang/rust-bindgen), should the `build-bindgen` feature not be set.
 
+The wasm3 c source is included via a submodule, so before building the submodule has to be initialized, this can be done via:
+```sh
+git submodule update --init
+```
+
+Then to build the project run:
+
 ```sh
 cargo install bindgen
 cargo build --release

wasm3-sys/build.rs

@@ -4,7 +4,7 @@ use std::fmt::Write as _;
 use std::fs;
 use std::path::{Path, PathBuf};
 
-static WASM3_SOURCE: &str = "wasm3";
+static WASM3_SOURCE: &str = "wasm3/source";
 const WHITELIST_REGEX_FUNCTION: &str = "([A-Z]|m3_).*";
 const WHITELIST_REGEX_TYPE: &str = "(?:I|c_)?[Mm]3.*";
 const WHITELIST_REGEX_VAR: &str = WHITELIST_REGEX_TYPE;
@@ -74,7 +74,7 @@ fn gen_bindings() {
             }
         ))
         .arg("-Dd_m3LogOutput=0")
-        .arg("-Iwasm3");
+        .arg("-Iwasm3/source");
     let status = bindgen.status().expect("Unable to generate bindings");
     if !status.success() {
         panic!("Failed to run bindgen: {:?}", status);