[PATCH] Fix vfork with --enable-add-ons=linuxthreads

[Ulrich Drepper]

Jakub Jelinek wrote:

> The following new test (tst-popen) got broken when vfork has been
> made hidden in libc. linuxthreads really needs to use full-blown
> fork if pthread_create has been ever called.

Thanks, I've applied the patch.

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