Update master to build with Xcode 9 beta 4

[shahmishal]

No description provided.

[shahmishal]

@swift-ci Please test Linux

[swift-ci]

Build failed
Jenkins build - Swift Test Linux Platform
Git Commit - 64a77ca
Test requested by - @shahmishal

[moiseev]

@swift-ci Please test Linux

[shahmishal]

@swift-ci Please test Linux

[swift-ci]

Build failed
Jenkins build - Swift Test Linux Platform
Git Commit - 64a77ca
Test requested by - @shahmishal

[AnshulYADAV007]

Hey @shahmishal,

I want to contribute to Swift. Currently I am doing two online courses viz "Compilers" by Stanford Lagunita and "Developing iOS 10 Apps with swift" on ITunes U. I have done my graduation in Computer Science and Engineering, thus you can assume knowledge of Datastructures and Algorithms and concepts of OOPs. Will these courses be sufficient for the theoretical knowledge needed to contribute to this project? Or should I choose some other courses before contributing to this project.

Please guide me about the preparation part for contributing to the project. Here is my email address: [email protected].

Thanks