Enable .net5 support for dotnet-svcutil. (#4452)
Enable .net5 support for dotnet-svcutil. (#4452)


imcarolwang/wcf,dotnet/wcf,dotnet/wcf,imcarolwang/wcf,mconnew/wcf,imcarolwang/wcf,mconnew/wcf,mconnew/wcf,dotnet/wcf