Enable test_mmap on net8.0/POSIX #1860
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Establishing a mmap test from StdLib on POSIX to prevent unnoticed regressions from #1855.
The test does not pass on .NET 6.0, which has problems with mmaps not backed by an existing file. A workaround is possible, but likely quite tricky to get it right (i.e. w/o data leaking). I don't think it is worth the effort given that .NET 6.0 is now past its EOL.
The case of Mono seems hopeless; it dumps core when running this test.