[swift-dev] Error running build-script -R?

[Austin Zheng]

Hi,

I've running into an issue where I can't build Swift successfully. Right before it errors out I get the following message:

```
<unknown>:0: error: Swift does not support the SDK 'MacOSX10.11.sdk'
[564/990] Generating UnicodeExtendedGraphemeClusters.cpp from UnicodeExtendedGraphemeClusters.cpp.gyb with ptr size = 8
ninja: build stopped: subcommand failed.
utils/build-script: fatal error: command terminated with a non-zero exit status 1, aborting
```

I've tried deleting my `build` folder and updating my repo/all dependencies, but the problem persists. It only started happening yesterday. Has anyone else seen this, or know what it means? (I don't have Xcode 8 on this machine, if that matters, and I'm running OS X 10.11.5.)

Best,
Austin
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