Support tvOS

[enricmacias]

Adds the changes from #358

[MrMage]

Thanks! Can this be applied to the Carthage project as well? And why did the BoringSSL dependency need to be deleted?

[enricmacias]

The official BoringSSL doesn't support tvOS. But the one included in gRPC-Core library (BoringSSL-GRPC) it does. It is working fine with that library.

[enricmacias]

About Carthage. I tried adding config.build_settings["TVOS_DEPLOYMENT_TARGET"] = "10.0" to fix-project-settings.rb, but for some reason it is not working as expected.

We may need to check which SDK target is using and set the appropriate deployment target for each one. I need some time/help for that, I don't really know how this ruby files are working at all.

[MrMage]

About Carthage. I tried adding config.build_settings["TVOS_DEPLOYMENT_TARGET"] = "10.0" to fix-project-settings.rb, but for some reason it is not working as expected.

We may need to check which SDK target is using and set the appropriate deployment target for each one. I need some time/help for that, I don't really know how this ruby files are working at all.

What is the error you are getting with that when running make project-carthage?

[MrMage]

@enricmacias thank you! Two more things:

1. We now have a merge conflict because the Carthage project on the master branch has changed in the meantime. I would suggest merging master into your branch, then running make project-carthage a second time.
2. Could you please verify that the Carthage project builds on your machine? You should be able to open it in Xcode and then click "Build".

[enricmacias]

@MrMage I merged the master into my branch and run make project-carthage .

About the Carthage project building on my machine. I've already created a new tvOS project and installed SwiftGRPC through Carthage. The project compiled and run without a problem. Is that what you wanted for me to check?

[MrMage]

About the Carthage project building on my machine. I've already created a new tvOS project and installed SwiftGRPC through Carthage. The project compiled and run without a problem. Is that what you wanted for me to check?

Yes, that's perfect. Thank you!

I will close and re-open the PR to re-run CI.