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

[David Xu]

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?
>
>  
>
Then commit it if the patch is right, do you have fully tested it ?

David Xu