fix gctx init slice bounds out of range on ios platform

[omegamt]

#2039

[codecov-commenter]

Codecov Report

Merging #2062 (e5160d9) into master (e4c8cfc) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2062      +/-   ##
==========================================
- Coverage   76.47%   76.43%   -0.04%     
==========================================
  Files         517      516       -1     
  Lines       46828    46594     -234     
==========================================
- Hits        35810    35615     -195     
+ Misses       9041     9013      -28     
+ Partials     1977     1966      -11     

Flag	Coverage Δ
go-1.15-386	?
go-1.15-amd64	?
go-1.16-386	76.38% <0.00%> (?)
go-1.16-amd64	76.38% <0.00%> (+0.03%)	⬆️
go-1.17-386	?
go-1.17-amd64	?
go-1.18-386	76.38% <0.00%> (?)
go-1.18-amd64	76.38% <0.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
os/gctx/gctx.go	84.84% <0.00%> (-5.78%)	⬇️
contrib/drivers/oracle/oracle.go
os/gspath/gspath_cache.go	94.73% <0.00%> (+7.01%)	⬆️

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[gqcn]

@omegamt IOS平台上的Env如果不带有=符号的话，是什么样子的？

[omegamt]

@gqcn iPhone真机release是正常的 debug模式下 os.Environ() 模拟器上print 后, 其中有一行的值是 \371\246t\366\241!