Rollup merge of #55659 - alexcrichton:musl-no-group, r=michaelwoerister

rustc: Delete grouping logic from the musl target

This commit deletes the injection of `-(` and `-)` options to the linker
for the musl targets. This actually causes problems today on nightly if
you execute:

    $ echo 'fn main() {}' >> foo.rs
    $ rustc --target x86_64-unknown-linux-musl -C panic=abort

you get a linker error about "cannot nest groups". This comes about
because rustc injects its own `--start-group` and `--end-group`
variables which clash with the outer `-(` and `-)` variables. It's not
entirely clear to me why this doesn't affect the musl target by default
(in `-C panic=unwind` mode).

The compiler's own injection of `--start-group` and `--end-group` should
solve the issues mentioned in the comment for injecting `-(` and `-)` as
well.

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