Bug#749560: problem of transmission under new miniupnpc

[Petr Salinger <Petr.Salinger@seznam.cz>]

> Everything's good except for transmission, which failed on kfreebsd. 
> Probably a miniupnpc call only compiled on that architecture.

In fact, the problem is sligthly different.
The transmission package does not support newly
supplied libminiupnpc-dev under both Linux and kFreeBSD:

"checking supported miniupnp library... none"

As a result, it tries to use embedded version
from transmission-2.82/third-party/miniupnp/

On kFreeBSD, the build fails.
On Linux, the build succeeds, but the resulting binary
does not Depend: libminiupnpc10, as it have been expected.

Cheers

	Petr