Re-enable and fix unit test for nofork mappings

This test was previously written to use the contents of the system
headers to decide whether INHERIT_NONE or INHERIT_ZERO was going to
work.  But that won't work across different environments, such as
(for example) when the kernel doesn't match the headers.  Instead,
we add a testing-only feature to the code to track which of these
options actually worked, and verify that it behaved as we expected.

Closes ticket 29541; bugfix not on any released version of Tor.

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