[PATCH] Added error message for qemu-user fake_open which clears up misleading open() errors which are caused by QEMU interception of open() rather than the linux-user's open()

[Brandon Falk]

Add error message for fake open calls when failing to create a temporary
file. I spent some time debugging an issue where for some reason I thought
/proc was misbehaving in the linux-user chroot environment, but it was
rather QEMU silently failing (and passing through an error) to the guest
application, even though it was a QEMU issue related to creating a
temporary file in the chrooted environment.

patch
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