Bug#631639: __unused in libbsd. workaround for #522773 (linux) and #522774 (libc)

[Thorsten Glaser <tg@mirbsd.de>]

Robert Millan dixit:

>This patch implements a workaround for __unused name collision with Linux and
>Glibc.  The trick is to define __unused only when in overlay mode, and then

That won’t help. The overlay mode uses pkg-config which no BSD thing touches.

bye,
//mirabilos
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