Remove unused GCC ignore in opt-dist

The `CiGcc` step is not enabled by defaut, so it does not have to be skipped.

Author: Kobzol

src/tools/opt-dist/src/main.rs

@@ -454,7 +454,6 @@ fn main() -> anyhow::Result<()> {
             "clippy",
             "miri",
             "rustfmt",
-            "gcc",
             "generate-copyright",
             "bootstrap",
         ] {