Rename custom __packed__ attribute to __o3000_packed__macOS

Note: It is generally a bad idea to create identifier that start with an
underscore [1].

In macOS the identifier __packed__ is already defined, because the
packed attribute is written as __attribute__ ((__packed__)), which
causes the code to fail to compile. To solve the problem this commit
replaces __packed__ with __o3000_packed__.

[1]: https://en.cppreference.com/w/c/language/identifier#Reserved_identifiers

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