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fs: Fix #50619 (again) and add a regression test Bug #50619 was fixed by adding an end_of_stream flag in #50630. Unfortunately, that fix only applied to the readdir_r() path. When I switched Linux to use readdir() in #92778, I inadvertently reintroduced the bug on that platform. Other platforms that had always used readdir() were presumably never fixed. This patch enables end_of_stream for all platforms, and adds a Linux-specific regression test that should hopefully prevent the bug from being reintroduced again.