refactor: Remove all dependences on ring 0.16

[Xuanwo]

Close https://github.com/mozilla/sccache/issues/1442

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (9d1696b) 30.87% compared to head (b92dfb3) 30.78%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2036 +/- ## ========================================== - Coverage 30.87% 30.78% -0.09% ========================================== Files 51 51 Lines 19624 19582 -42 Branches 9420 9408 -12 ========================================== - Hits 6058 6028 -30 + Misses 7876 7845 -31 - Partials 5690 5709 +19 ```

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[lysliu]

This PR works on s390x

warning: unused import: `self::toolchain_imp::*`
  --> src/dist/pkg.rs:23:9
   |
23 | pub use self::toolchain_imp::*;
   |         ^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: `sccache` (lib) generated 1 warning (run `cargo fix --lib -p sccache` to apply 1 suggestion)
    Finished dev [unoptimized + debuginfo] target(s) in 1m 04s

I can get a s390x binary after success build

-rwxr-x---   2 root root 424883184 Jan 16 08:05 sccache*
-rw-r-----   1 root root      1471 Jan 16 08:05 sccache.d
root@zenv:~/sccache/target/debug# ./sccache --version
sccache 0.7.5
root@zenv:~/sccache/target/debug# uname -m
s390x

[sylvestre]

excellent, thanks