Try to support illumos

[LecrisUT]

I don't have the expertise to actually chase this down, but wanted to point out the current issue with trying to build for illumos. This issue is a blocker for upgrading rustls package in atuin and to move away from ring.

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[LecrisUT]

In short the issue is:

   --- stderr
  Evaluating: AWS_LC_SYS_EXTERNAL_BINDGEN='0'
  Parsed: AWS_LC_SYS_EXTERNAL_BINDGEN=false
  Failure invoking external bindgen! 
  bindgen-PARAMS: --prefix-link-name aws_lc_0_26_0_ --allowlist-file .*(/|\\)openssl((/|\\)[^/\\]+)+\.h --allowlist-file .*(/|\\)rust_wrapper\.h --rustified-enum point_conversion_form_t --default-macro-constant-type signed --with-derive-default --with-derive-partialeq --with-derive-eq --raw-line 
  // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  // SPDX-License-Identifier: Apache-2.0 OR ISC
   --generate functions,types,vars,methods,constructors,destructors /home/runner/work/aws-lc-rs/aws-lc-rs/aws-lc-sys/include/rust_wrapper.h --rust-target 1.59 --output /target/x86_64-unknown-illumos/release/build/aws-lc-sys-d08023f950b0ca18/out/bindings.rs --formatter rustfmt -- -I /home/runner/work/aws-lc-rs/aws-lc-rs/aws-lc-sys/include -I /home/runner/work/aws-lc-rs/aws-lc-rs/aws-lc-sys/aws-lc/include
  bindgen-STDOUT: 
  bindgen-STDERR: /usr/include/stdint.h:26:10: fatal error: 'bits/libc-header-start.h' file not found
  Unable to generate bindings: clang diagnosed error: /usr/include/stdint.h:26:10: fatal error: 'bits/libc-header-start.h' file not found
  thread 'main' panicked at aws-lc-sys/builder/main.rs:643:5:
  aws-lc-sys build failed. Please enable the 'bindgen' feature on aws-lc-rs or aws-lc-sys.For more information, see the aws-lc-rs User Guide: https://aws.github.io/aws-lc-rs/index.html
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Specifically

/usr/include/stdint.h:26:10: fatal error: 'bits/libc-header-start.h' file not found

[justsmth]

Thanks for the PR! We'll look into any failure that occurs.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.89%. Comparing base (c358484) to head (250da9c).
Report is 177 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #709      +/-   ##
==========================================
- Coverage   95.80%   92.89%   -2.91%     
==========================================
  Files          61       70       +9     
  Lines        8143     9538    +1395     
  Branches        0     9538    +9538     
==========================================
+ Hits         7801     8860    +1059     
- Misses        342      412      +70     
- Partials        0      266     +266     

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