[Directory.Build.props] Set a dummy PackageVersion to work around VS/NuGet issue #971
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Context: NuGet/Home#6461
Trying to build
Java.Interop.csprojin Visual Studio currently fails with several errors like:Even though we don't build NuGet packages, it still attempts to calculate the NuGet package name, which includes the assembly
$(Version)if$(PackageVersion)isn't specified. Because our assemblies have different versions per-TFM, that causes a problem because the package can't have multiple versions in it.We can set a dummy
$(PackageVersion)because we don't actually need it.Also updates the
generator.slnffor additional needed projects to buildgenerator.