Don't reuse the command between c/c++

crates/misc/run-examples/src/main.rs

@@ -52,6 +52,7 @@ fn main() {
             .arg(&example));
 
         println!("======== C/C++ example `{}` ============", example);
+        for extension in ["c", "cc"].iter() {
             let mut cmd = cc::Build::new()
                 .opt_level(0)
                 .cargo_metadata(false)
@@ -64,7 +65,6 @@ fn main() {
                 .get_compiler()
                 .to_command();
 
-        for extension in ["c", "cc"].iter() {
             let file = if is_dir {
                 format!("examples/{}/main.{}", example, extension)
             } else {