patch for threads/76690 - critical - fork hang in child for -lc_r

[Julian Elischer]

the bug is still valid in 4.x


Andriy Tkachuk wrote:

>>Is there a reason you are still using libc_r?
>>    
>>
>
>I don't use it at all, but there was critical bug
>i threads-pr - so i just decided to fix it since i
>have had some time )
>
>If this library is needless, why is it still there
>and this pr in criticals?
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