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

[Andriy Tkachuk]

> This is already fixed in libpthread in both -current and -stable.
> Your patch also pollutes the application namespace with a global
> symbol thread_lock -- there is already a symbol in malloc.c that
> is there just for this purpose (__malloc_lock).

yea, i see - you right. i just didn't noticed that this one is already
without
static. thanks.

Ok, now the libc don't changed, and updated patch see in attachment.

Thanks,
  Andriy.
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