Improve save-temps gcc flags detection

[AJIOB]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.09%. Comparing base (760a109) to head (a91e4cf).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/compiler/gcc.rs	88.88%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2540      +/-   ##
==========================================
+ Coverage   71.08%   71.09%   +0.01%     
==========================================
  Files          64       64              
  Lines       35432    35475      +43     
==========================================
+ Hits        25186    25221      +35     
- Misses      10246    10254       +8     

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