Fix name conflict when using C++ keywords

[fzyzcjy]

Close #1890

[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 99.23%. Comparing base (b1e07a8) to head (3980ffd).

Files	Patch %	Lines
frb_codegen/src/library/utils/cbindgen_keywords.rs	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1943      +/-   ##
==========================================
- Coverage   99.24%   99.23%   -0.02%     
==========================================
  Files         368      369       +1     
  Lines       15710    15726      +16     
==========================================
+ Hits        15591    15605      +14     
- Misses        119      121       +2     

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