Log Message:
Fix opencpn on arm

For some reason ocpnDC::DrawEllipse is miscompiled on NetBSD 8.0_BETA earmv7hf:
for the tail call to dc->DrawEllipse() the compiler emits a bx instruction,
but forgets to load the address of the function in the register.
Add a memory barrier to works around this problem by avoiding the tail-call
optimisation.
Other similar functions in this file are properly compiled ...

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