Enable compilers other than gcc (#6)

issue: #1
Reviewed-on: http://192.168.1.227:3000/sfrembling/pallet/pulls/6
Co-authored-by: godsfryingpan <sfrembling@gmail.com>
Co-committed-by: godsfryingpan <sfrembling@gmail.com>

src/app.rs

@@ -274,7 +274,7 @@ fn build(mode: &Option<String>, force_recompile: bool) -> std::io::Result<()> {
         }
     }
 
-    let mut command = Command::new("gcc");
+    let mut command = Command::new(conf.compiler.as_deref().unwrap_or("gcc"));
 
     for arg in &build_config.args {
         command.arg(arg);