[patch] Drop windows specific handling of equivalent destructors

[Rafael Espíndola]

Now that the relevant tests use -mconstructor-aliases and the missing
features have been implemented, we can just drop this.

This technique is quiet interesting and a bit more elegant than using
rauw, but it would require a fairly invasive change to how we emit
thunks to make it general, so it is probably better to just remove it
for now.

Cheers,
Rafael
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