fix binaryop vulkan shader compilation on moltenvk

[nihui]

No description provided.

[tencent-adm]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.42%. Comparing base (7237643) to head (4e1b788).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #6602    +/-   ##
========================================
  Coverage   93.41%   93.42%            
========================================
  Files         868      868            
  Lines      275540   275711   +171     
========================================
+ Hits       257391   257578   +187     
+ Misses      18149    18133    -16     

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