Remove references to obsolete Cake members.

[Mattias Karlsson]

Probably it's because Cake.Incubator used in integration tests provides extension methods for DotNetBuildSettings.

Originally posted by @devlead in cake-build/cake#2837 (comment)

Or this addin will stop to work when Cake 1.0 is released.

[cake-contrib-bot]

🎉 This issue has been resolved in version 8.0.0 🎉

The release is available on:

• GitHub Release
• NuGet Package

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