Change .fallthrough to __fallthrough__

Implementing it as a control statement has the bad thing that it's
impossible to be compatible with other assemblers such as ca65, as you
cannot create dummy control statements or something like that in
there. Instead of that, we define it with the special underscores which
are still valid for identifiers, and give a "compiler-specific thingie"
flair to it.

This also has the benefit that the parser can be a bit more strict.

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>

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