Fix strerror tests yet again

Change-Id: I4a41913a5358d87ca12e308460196112ee5dccf2
Reviewed-on: http://review.couchbase.org/29954
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>