[PATCH v2] posix: Avoid allocation while holding atfork_lock [BZ 34321]

[Florian Weimer]

* H. J. Lu:

> Here is the updated test using elf/dl-minimal-malloc.c.

The minimal malloc is not thread-safe (it relies on the loader lock).
The test case is multi-threaded.  I don't think this is a good
combination.

Thanks,
Florian