Provide paths to c-api headers as cargo links metadata

Author: maxbrunsfeld

crates/c-api/Cargo.toml

@@ -7,6 +7,8 @@ license = "Apache-2.0 WITH LLVM-exception"
 repository = "https://github.com/bytecodealliance/wasmtime"
 readme = "README.md"
 edition.workspace = true
+links = "wasmtime-c-api"
+include = ["include", "src", "wasm-c-api/include", "build.rs"]
 
 [lints]
 workspace = true

crates/c-api/build.rs

@@ -0,0 +1,5 @@
+fn main() {
+    let dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+    println!("cargo:include={dir}/include");
+    println!("cargo:wasm_include={dir}/wasm-c-api/include");
+}