docs: Update reference to xcode 8.3.3 (#16267)

* Update reference to xcode

* Update to reflect use of 10.12 SDK
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John Kleinschmidt 2019-01-04 13:05:12 -05:00 committed by GitHub
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@ -36,26 +36,7 @@ the following Python modules:
If you're developing Electron and don't plan to redistribute your
custom Electron build, you may skip this section.
For certain features (e.g. pinch-zoom) to work properly, you must target the
macOS 10.10 SDK.
Official Electron builds are built with [Xcode 8.2.1](http://adcdownload.apple.com/Developer_Tools/Xcode_8.2.1/Xcode_8.2.1.xip), which does not contain
the 10.10 SDK by default. To obtain it, first download and mount the
[Xcode 6.4](http://developer.apple.com/devcenter/download.action?path=/Developer_Tools/Xcode_6.4/Xcode_6.4.dmg)
DMG.
Then, assuming that the Xcode 6.4 DMG has been mounted at `/Volumes/Xcode` and
that your Xcode 8.2.1 install is at `/Applications/Xcode.app`, run:
```sh
cp -r /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
```
You will also need to enable Xcode to build against the 10.10 SDK:
- Open `/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Info.plist`
- Set the `MinimumSDKVersion` to `10.10`
- Save the file
Official Electron builds are built with [Xcode 8.3.3](http://adcdownload.apple.com/Developer_Tools/Xcode_8.3.3/Xcode_8.3.3.xip), and the MacOS 10.12 SDK. Building with a newer SDK works too, but the releases currently use the 10.12 SDK.
## Building Electron