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 74.34%. Comparing base (6f7e664) to head (81e96e1).

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

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2665      +/-   ##
==========================================
+ Coverage   74.27%   74.34%   +0.06%     
==========================================
  Files          70       70              
  Lines       39325    39373      +48     
==========================================
+ Hits        29208    29270      +62     
+ Misses      10117    10103      -14     

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[AJIOB]

Hi @sylvestre ,

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

I hope you have some time for it.

[codspeed-hq]

Merging this PR will not alter performance

✅ 60 untouched benchmarks
⏩ 4 skipped benchmarks¹

---

_{Comparing AJIOB:fix-asm-depfile (81e96e1) with main (6f7e664)}

Footnotes

1. 4 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[AJIOB]

Cannot do it without explicit external if, because clippy is not happy with if let ... && ... and with if ... && let ...

See rust-lang/rust#53667 for more details

[sylvestre]

please add integration tests for both gcc & clang
thanks

[AJIOB]

Looks like freebsd error is not related to my changes.

So, the PR is ready.

@sylvestre , I've added the integration tests too