do not add stdlib to outputs without compilers

[h-vetinari]

See discussion in #2328

CC @isuruf @beckermr

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 71.44%. Comparing base (b1f63c6) to head (6c4de73).

Files	Patch %	Lines
conda_forge_tick/migrators/cstdlib.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2330      +/-   ##
==========================================
- Coverage   71.52%   71.44%   -0.08%     
==========================================
  Files          99       99              
  Lines        9842     9837       -5     
==========================================
- Hits         7039     7028      -11     
- Misses       2803     2809       +6     

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