* This PR adds an option use.platformToolsetVersion that makes the build systems to use this platform toolset version. * This also makes sure that win-vs-upgrade.cmd does not get executed when the use.platformToolsetVersion option is specified.
* This PR adds an option use.platformToolsetVersion that makes the build systems to use this platform toolset version. * This also makes sure that win-vs-upgrade.cmd does not get executed when the use.platformToolsetVersion option is specified.