[Bug 293180] science/mmdb2: fix build with libc++ 21

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293180

            Bug ID: 293180
           Summary: science/mmdb2: fix build with libc++ 21
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: yuri@freebsd.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(yuri@freebsd.org)
          Assignee: yuri@freebsd.org

With lib++ 21 science/mmdb2 fails to build, with errors similar to:

    In file included from mmdb2/mmdb_machine_.cpp:41:
    mmdb2/mmdb_machine_.h:296:13: error: unknown type name 'size_t'; did you
mean 'std::size_t'?
      296 |     typedef size_t fpstr_size_t;
          |             ^~~~~~
          |             std::size_t
    /usr/include/c++/v1/__cstddef/size_t.h:20:7: note: 'std::size_t' declared
here
       20 | using size_t = decltype(sizeof(int));
          |       ^

This is because mmdb2 apparently relies on transitive includes getting
the declaration of size_t, but with libc++ 21 this no longer works. Add
an include of <stddef.h> to work around it.

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