Disable preprocessor cache when doing distributed compilation

[glandium]

At the moment, it doesn't work.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 16.66667% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 29.91%. Comparing base (0cc0c62) to head (6b2c27d).
Report is 34 commits behind head on main.

Files	Patch %	Lines
src/compiler/c.rs	16.66%	1 Missing and 9 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2173      +/-   ##
==========================================
- Coverage   30.91%   29.91%   -1.00%     
==========================================
  Files          53       53              
  Lines       20112    20185      +73     
  Branches     9755     9684      -71     
==========================================
- Hits         6217     6038     -179     
- Misses       7922     8228     +306     
+ Partials     5973     5919      -54     

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