Currently, on non-Windows platforms, it is possible to have a multi-target native module and specify building just some of the targets using `node-gyp build my_target`. On Windows, however, specifying the target(s) to build requires the [`/t:` or `/target:` flag](https://msdn.microsoft.com/en-us/library/ms164311.aspx). Without this change you will get the error `MSB1008` because MSBuild things you are trying to specify multiple solutions.