Kyle Evans a1fa478b1c posix_spawn: mark error as volatile
In the case of an error, the RFSPAWN'd thread will write back to psa->error
with the correct exit code. Mark this as volatile as the return value is
being actively dorked up for erroneous exits on !x86.

This fixes the following tests, tested on aarch64 (only under qemu, at the
moment):

- posix_spawn/spawn_test:t_spawn_missing
- posix_spawn/spawn_test:t_spawn_nonexec
- posix_spawn/spawn_test:t_spawn_zero

Reported by:	mikael
MFC after:	3 days
2020-01-21 22:02:53 +00:00
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