Fix clippy::redundant_guards warning

```
error: redundant guard
   --> src/main.rs:652:20
    |
652 |         Some(p) if matches!(p, "release" | "bench") => "release",
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_guards
    = note: `-D clippy::redundant-guards` implied by `-D warnings`
help: try
    |
652 -         Some(p) if matches!(p, "release" | "bench") => "release",
652 +         Some("release" | "bench") => "release",
    |

error: redundant guard
   --> src/main.rs:653:20
    |
653 |         Some(p) if matches!(p, "dev" | "test") => "debug",
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_guards
help: try
    |
653 -         Some(p) if matches!(p, "dev" | "test") => "debug",
653 +         Some("dev" | "test") => "debug",
    |
```

src/main.rs

@@ -649,8 +649,8 @@ fn object_files(cx: &Context) -> Result<Vec<OsString>> {
     let profile = match cx.args.profile.as_deref() {
         None if cx.args.release => "release",
         None => "debug",
-        Some(p) if matches!(p, "release" | "bench") => "release",
-        Some(p) if matches!(p, "dev" | "test") => "debug",
+        Some("release" | "bench") => "release",
+        Some("dev" | "test") => "debug",
         Some(p) => p,
     };
     target_dir.push(profile);