Port more host code to the new bindings.

Author: sunfishcode

crates/wasi/src/preview2/command.rs

@@ -93,7 +93,7 @@ pub mod sync {
         },
     });
 
-    pub fn add_to_linker<T: WasiView>(
+    pub fn add_to_linker<T: WasiView + Sync>(
         l: &mut wasmtime::component::Linker<T>,
     ) -> anyhow::Result<()> {
         crate::preview2::bindings::clocks::wall_clock::add_to_linker(l, |t| t)?;