Update to nzbget port

[Nicolas]

Hi

I have successfully updated the nzbget port to 0.17.1 and ran it without 
issues on FreeBSD 10.3 amd64.

To compile it with clang 3.4, I have added the following things 
"-std=c++1y -stdlib=libc++" to the Makefile on the CPPFLAGS line.

To create the package, I have removed the AUTHORS entry in pkg-plist

I don't know if this is the best way to update the port.

The diff is attached to this email

If this is the correct way, I will submit it to bugzilla

Regards

Nicolas

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