Fixing MSBuild not Exiting

After upgrading to Visual Studio Xamarin 4.1 from 4.0 our TeamCity build suddenly stopped working.  Actually it was working but won’t stop working.  The build would get hang after rebuilding out solution to create the IPA file.

The step in question looked like:

Solution Runner That Hangs

The TeamCity logs looked like:

[09:23:28][Foo\Foo.iOS\Foo.iOS.csproj] _SayGoodbye
[09:23:28][_SayGoodbye] SayGoodbye
[09:23:28][SayGoodbye] Compute signature for bin\iPhone\Release\FooiOS.app

The build would also hang if I logged into the build machine and ran the msbuild via the command line.  However, the build would not hang if built via Visual Studio.

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