Fix GH-11086: FPM: config test runs twice in daemonised mode #13357
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The previous check for STDERR did not work because it never actually gets
STDERR_FILENO
but new file descriptor which is greater than 2. Unfortunately I did not come up with a better way than checking the source file name which might not be always reliable and cover all case - specifically when there is a link to stderr. We could probably check a link (readlink) in such case and compare but it seems quite unlikely that anyone would use that - we can do it if anyone complains. I have been also tryingisatty
but that does not work if FPM is executed by script (specifically it does not work in our test env).