parser: new_native_define_var's last param is always the same.
parser: new_native_define_var's last param is always the same.

This is always called with the line number as lex->line_num. Omit the
last parameter and have the function source the line number itself. If
I ever have a use case for functions with custom line numbers I'll
revert this but I doubt that's going to happen.

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