Missing `os` functionality for Linux.

[graphitemaster]

There several missing functions remove, unlink, open, close, create_directory, remove_directory for Linux. It appears there's an os2 package in the works and this will eventually replace os? In either case odinfmt uses os.remove and doesn't build.

[gingerBill]

package os2 will eventually replace package os. (Similar to how sync2 will replace sync)

[github-actions[bot]]

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