Fix Ruby 3.2 warning "undefining the allocator of T_DATA class swig_runtime_data"
Ruby 3.2 (still in development) started warning about this, see
https://bugs.ruby-lang.org/issues/18007.
Note that the extension docs mention it in
https://ruby-doc.org/core-3.1.1/doc/extension_rdoc.html#label-C+struct+to+Ruby+object:
> The klass argument is the class for the object. The klass should
> derive from `rb_cObject`, and the allocator must be set by calling
> `rb_define_alloc_func` or `rb_undef_alloc_func`.
So in this case we call `rb_undef_alloc_func` to fix the warning.
Verified that this works in robinst/taglib-ruby#115.
Fixes #2257.
1 file changed
