This simply strips the include path to the posix compat headers from
the includes, but at the level of the local `Makefile` (so without
side effects on other modules/packages). Since libsocketcan is only
ever used on native, this should be fine.
Adds a separate board for native64 instead of the `NATIVE_64BIT` workaround.
The files in `boards/native64` are more or less dummy files and just include
the `boards/native` logic (similar to `openlabs-kw41z-mini-256kib`).
The main logic for native is in `makefiles/arch/native.inc.mk`, `cpu/native`
and `boards/native`.
The remaining changes concern the build system, and change native board checks
to native CPU checks to cover both boards.
