clean vulkan shader common extension

[nihui]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.34%. Comparing base (bf13c30) to head (9229328).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/gpu.cpp	55.55%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5952      +/-   ##
==========================================
- Coverage   95.34%   95.34%   -0.01%     
==========================================
  Files         819      819              
  Lines      268434   268435       +1     
==========================================
  Hits       255926   255926              
- Misses      12508    12509       +1     

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