Revert "Update BuildBoss to handle the new msbuild references."
Revert "Update BuildBoss to handle the new msbuild references."

This reverts commit a262f14082e405618a7931a67d1043d26c2bb0c5.

CyrusNajmabadi/roslyn,mavasani/roslyn,dotnet/roslyn,shyamnamboodiripad/roslyn,dotnet/roslyn,mavasani/roslyn,shyamnamboodiripad/roslyn,jasonmalinowski/roslyn,bartdesmet/roslyn,weltkante/roslyn,dotnet/roslyn,jasonmalinowski/roslyn,CyrusNajmabadi/roslyn,weltkante/roslyn,weltkante/roslyn,jasonmalinowski/roslyn,bartdesmet/roslyn,mavasani/roslyn,CyrusNajmabadi/roslyn,shyamnamboodiripad/roslyn,bartdesmet/roslyn