simplan.h - anonymous union

[Ashley]

While working on compiling Simutrans using Xcode I found that it was having trouble coping with using an anonymous union in the planquadrat_t object with the swap template:

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void swap(planquadrat_t& a, planquadrat_t& b)
{
sim::swap(a.this_halt, b.this_halt);
sim::swap(a.halt_list, b.halt_list);
sim::swap(a.ground_size, b.ground_size);
sim::swap(a.halt_list_count, b.halt_list_count);
sim::swap(a.data, b.data);
}


Giving the union a name seems to fix this. One-line patch attached.