Update `build.sh` to match other repos - currently attempts to `source KoreBuild.sh`
Update `build.sh` to match other repos
- currently attempts to `source KoreBuild.sh`

aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore