feat: avoid sccache wrapper when resolving compiler

[iTrooz]

This PR allows you to do things like /bin/sccache /usr/lib/sccache/gcc main.c

It can seem weird at first, but the same mechanism already existed for ccache. Personally, I had an issue with a build system that insisted on putting sccache as a wrapper, when I already had gcc as a sccache symlink, which is what prompted that PR

there's a change of behaviour for absolute path (why are now still changed to avoid wrappers) so I would understand if you didn't accept this PR

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.34%. Comparing base (8825b4a) to head (a53106f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2720      +/-   ##
==========================================
- Coverage   74.41%   74.34%   -0.07%     
==========================================
  Files          70       70              
  Lines       39211    39403     +192     
==========================================
+ Hits        29177    29296     +119     
- Misses      10034    10107      +73     

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