Unreal Lightmass does not build by default when building Solution from Promoted Github 4.12

When building the Promoted 4.12 Solution from Github as of the 4AM commit, the Unreal Lightmass project does not build by default.

This results in the inability to build lighting until Unreal Lightmass is built in Visual Studio

This is a regression of behavior from github in the previous commits and builds

1. Download the Zip file from Here
2. Extract Zip
3. Run Setup.bat
4. Run GenerateProjectFile.bat
5. Open teh Solution in VS2015
6. Build Solution

RESULTS: UnrealLightmass DLL files are not generated

EXPECTED: UnrealLightmass DLL are generated

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