As this pre-processor definition is defined in curl_setup.h there is no need to include it in the Visual Studio project files.
Added support for WinIDN build configurations to the VC6 project files.
Carrying on from commit 11025613b9 added a more thorough version of the VC6 project files which are capable of supporting side-by-side compilation, as well as support for some of the third-party libraries curl uses.
11025613b9