Temporarily add a signcheck exclusion to unblock aspnet builds (#4170)
Temporarily add a signcheck exclusion to unblock aspnet builds (#4170)

Workaround dotnet/core-setup#4797
aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore