Cordova released cordova-windows 5.0.0 with [CB-12189] Plugin WinMD+DLL combination - ASF JIRA (prebuilt WinMD+DLL support) that is needed for sqlite ref: Help with sqlite plugin on Windows 10 please?
When can this be included by PhoneGap Build? I am still waiting to get this fixed for a client.
PhoneGap build releases generally follow version releases of the PhoneGap CLI. As cordova-windows 5.0.0 was just released, it will take some time for it to propagate to the Cordova and PhoneGap CLI projects, and then to PGB. If you have an immediate need for this, you may need to consider building locally.
Tough to say as we are dependent upon the Cordova CLI open-source project, which runs on its own schedule managed by its contributors. History says it will likely be a month before you'll find that on PGB.