Task.leftShift has been deprecated

[BernardClabots]

I tried to compile in Debian 10. I needed to manually edit almost all the scripts to remove the "<<" statement and replace it by "doLast()"
On top, in Gradle 5. you can no longer directly execute a task. I therefore made task depend on each other so they get executed. I am not certain it is the right way, but I'd like to submit a pull request so at least the work of manually replacing the "<<" can be kept.

[BernardClabots]

Can you allow me to push to a branch? I don't understand how I can do that.