Hosts do not load both VST2 and VST3

Just to save someone else some time.
If you want your users to be able to install both formats and decide during runtime you will need to define

If that is not defined, multiple Juce files define it as true.
I can guess at the reason for this behaviour but consider it a trap and voodoo. IMHO a better solution would be to define this flag only if VST2 is not built, i.e. make it an explicit part of the projucer mask.