Jordan Rose d20a7ca64e [CMake] Switch to building the overlays in Swift 5 mode (#24350) ...

Now that that's stabilized, we don't have to keep them in Swift 4 mode
any longer. (Arguably we don't need the CMake variable at all, but it
may be useful again in the future.)

rdar://problem/49040980

2019-04-29 17:55:20 -07:00

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