"%DEVENVDIR%" is set by VsDevCmd. If it exists, the script was already called and we don't need to call it. Calling more than once VsDevCmd lead to exceed PATH characters limits as it appends paths to it.
"%DEVENVDIR%" is set by VsDevCmd. If it exists, the script was already called and we don't need to call it. Calling more than once VsDevCmd lead to exceed PATH characters limits as it appends paths to it.