.NET: Fix missing project file
<Compile Include="Cache\Query\Linq\CacheLinqTest.CompiledQuery.cs" />
<Compile Include="Cache\Query\Linq\CacheLinqTest.DateTime.cs" />
<Compile Include="Cache\Query\Linq\CacheLinqTest.Aggregates.cs" />
+ <Compile Include="Cache\Query\Linq\CacheLinqTest.Join.cs" />
<Compile Include="Cache\Query\Linq\CacheLinqTest.Join.LocalCollection.cs" />
<Compile Include="Cache\Query\Linq\CacheLinqTest.Strings.cs" />
<Compile Include="Cache\Query\Linq\CacheLinqTest.Functions.cs" />
