This creates 3 new build outputs:
* aspnetcore-targeting-pack-$(version).tar.gz
* aspnetcore-targeting-pack-$(version)-linux-x64.deb
* aspnetcore-targeting-pack-$(version)-linux-x64.rpm
Other changes:
* Make RPM packaging consistent with other installers. Vendor == Microsoft Corporation
* Add shared properties for building the targeting pack (or not building it in a servicing build)
Part of #6501
This adds a new Windows installer for the targeting pack. It places *.dll and *.xml (docs) in `[DOTNETHOME]\packs\Microsoft.AspNetCore.App.Ref\$(version)\ref\netcoreapp3.0`.
Outputs:
* aspnetcore-targeting-pack-$(version).zip
* aspnetcore-targeting-pack-$(version)-win-x64.exe (defaults to C:\Program Files\dotnet)
* aspnetcore-targeting-pack-$(version)-win-x86.exe (defaults to C:\Program Files (x86)\dotnet)
These all include the same files. These are meant to be bundled in the .NET Core SDK installer, but can be launched directly too.