Fix rb_struct_define terminator
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`rb_struct_define` expects `char*` list. `0` is just an `int`, and it is smaller than a pointer on platforms where `sizeof(char*) > sizeof(int)`. This bug caused a segfault (https://bugs.ruby-lang.org/issues/12450).
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rb_struct_defineexpectschar*list.0is just anint, and it is smaller than a pointer on platforms wheresizeof(char*) > sizeof(int).This bug caused a segfault (https://bugs.ruby-lang.org/issues/12450).