Disable -Woverriding-t-option

[justsmth]

Context

• Our MacOS (x86-64) builds for aws-lc-sys-fips have started failing recently. For example: https://github.com/aws/aws-lc-rs/actions/runs/11675784224/job/32547525030#step:9:1

  clang: error: overriding '-mmacosx-version-min=13.7' option with '--target=x86_64-apple-macosx14.2' [-Werror,-Woverriding-t-option]

• This issue only affects our FIPS build due to platform-specific CMake logic that adds the -mmacosx-version-min= compiler flag on FIPS builds.

Description of changes:

• This change adds the -Wno-overriding-t-option compiler flag when building aws-lc-sys-fips to avoid this failure.

Call-outs:

• Fixed several new Clippy findings affecting test logic.

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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.62%. Comparing base (c358484) to head (89c9b55).
Report is 108 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #584      +/-   ##
==========================================
- Coverage   95.80%   92.62%   -3.18%     
==========================================
  Files          61       67       +6     
  Lines        8143     9544    +1401     
  Branches        0     9544    +9544     
==========================================
+ Hits         7801     8840    +1039     
- Misses        342      430      +88     
- Partials        0      274     +274     

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