Don't wait depfiles for gcc/clang preprocessed inputs

[AJIOB]

Fixes #2664

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.87500% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.25%. Comparing base (d11e2e0) to head (79cbc5f).

Files with missing lines	Patch %	Lines
src/compiler/gcc.rs	96.87%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2665      +/-   ##
==========================================
+ Coverage   74.17%   74.25%   +0.07%     
==========================================
  Files          70       70              
  Lines       39207    39255      +48     
==========================================
+ Hits        29083    29149      +66     
+ Misses      10124    10106      -18     

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[AJIOB]

Hi @sylvestre ,

Friendly ping for this PR (and anothers too, please).

I hope you have some time for it.