[Plat-11044] remove stat

[kstenerud]

Goal

stat and fstat are on Apple's grey list now because they can be used to assist in user tracking. Remove them since we have other alternatives.

[github-actions]

Bugsnag.framework binary size increased by 16 bytes from 713,488 to 713,504

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +76  +0.0%     +76    __TEXT,__text
  +0.2%      +8  +0.2%      +8    Lazy Binding Info
  +0.0%      +8  +0.0%      +8    String Table
  [ = ]       0  -0.2%     -16    [__LINKEDIT]
  -0.4%     -76  -0.4%     -76    [__TEXT]
  +0.0%     +16  [ = ]       0    TOTAL

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