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`(exit N); exit N'. Otherwise, those many tests could exit with
improper exit status when exiting via e.g., a trapped interrupt.
Thanks to a report from Bob Proulx.
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PATH through to the process we exec as non-root.
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since /bin/sh of at least NetBSD 1.6 and OpenBSD 3.2 don't accept `^'.
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rather than trying go write to an write-protected file.
When running as root, ensure $NON_ROOT_USERNAME is valid.
When running as root with `require-non-root', ensure that `.'
is writable by $NON_ROOT_USERNAME, then reinvoke $0 set-user-ID
to $NON_ROOT_USERNAME. If `.' is not writable, then skip the test.
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NON_ROOT_USERNAME-checking code to this file.
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That's not portable to e.g., Solaris2.6's /bin/sh.
Communicate via an envvar instead.
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