Fix wasm build issues introduced by switching to wasi-sdk (#4407)

* Don't shell out for extracting tar.gz files

* Avoid wasi-sdk adding dependency on libc.so

* Clippy

* Fix -nostdlib flag

xtask/src/generate.rs

@@ -42,9 +42,6 @@ pub fn run_fixtures(args: &GenerateFixtures) -> Result<()> {
                 &format!("target/release/tree-sitter-{grammar_name}.wasm"),
                 grammar_dir.to_str().unwrap(),
             ]);
-            if args.docker {
-                cmd.arg("--docker");
-            }
             bail_on_err(
                 &cmd.spawn()?.wait_with_output()?,
                 &format!("Failed to regenerate {grammar_name} parser to wasm"),

xtask/src/main.rs

@@ -123,9 +123,6 @@ struct GenerateFixtures {
     /// Generates the parser to WASM
     #[arg(long, short)]
     wasm: bool,
-    /// Run emscripten via docker even if it is installed locally.
-    #[arg(long, short, requires = "wasm")]
-    docker: bool,
 }
 
 #[derive(Args)]