Default to the native host for wasmtime compile (#6152)

This commit updates the implementation of the `wasmtime compile` to use
the native host as the default targeted output. Previously the string
for the native host's target was used as the default target, but this
notably disables CPU feature inference meaning that the baseline was
always generated.

src/commands/compile.rs

@@ -5,7 +5,6 @@ use clap::Parser;
 use once_cell::sync::Lazy;
 use std::fs;
 use std::path::PathBuf;
-use target_lexicon::Triple;
 use wasmtime::Engine;
 use wasmtime_cli_flags::CommonOptions;
 
@@ -61,12 +60,7 @@ impl CompileCommand {
     pub fn execute(mut self) -> Result<()> {
         self.common.init_logging();
 
-        let target = self
-            .target
-            .take()
-            .unwrap_or_else(|| Triple::host().to_string());
-
-        let config = self.common.config(Some(&target))?;
+        let config = self.common.config(self.target.as_deref())?;
 
         let engine = Engine::new(&config)?;