compileEnumConst: check src enum to _cgoe_enum

[visualfc]

fix https://github.com/goplus/c2go/issues/156

.c file enum use prefix enum { ONE }; to -> _cgoe_ONE

[codecov-commenter]

Codecov Report

Base: 88.80% // Head: 88.84% // Increases project coverage by +0.03% :tada:

Coverage data is based on head (485b507) compared to base (df06408). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
+ Coverage   88.80%   88.84%   +0.03%     
==========================================
  Files          10       10              
  Lines        3341     3352      +11     
==========================================
+ Hits         2967     2978      +11     
  Misses        293      293              
  Partials       81       81              

Impacted Files	Coverage Δ
cl/blockctx.go	86.30% <ø> (ø)
cl/compile.go	95.03% <100.00%> (+0.01%)	:arrow_up:
cl/expr.go	91.26% <100.00%> (+0.05%)	:arrow_up:
cl/multifiles.go	93.79% <100.00%> (+0.08%)	:arrow_up:
cl/type_and_var.go	88.52% <100.00%> (+0.11%)	:arrow_up:

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