OS X Swift installation test fails due to using prebuilt binary for wrong Swift version

[bdash]

When releasing v2.4.3 tonight the installation examples job failed: https://ci.realm.io/job/Cocoa%20Release%20Installation%20Examples/37/.

In particular, the two jobs that test Swift with our prebuilt dynamic libraries fail with errors like this:

/Users/realm/workspace/Cocoa Release Installation Examples/binding/swift/method/dynamic/platform/osx/realm-cocoa/examples/installation/osx/swift-3.0/DynamicExample/DynamicExample/AppDelegate.swift:20:8: error: module compiled with Swift 3.0 cannot be imported in Swift 3.0.2: /Users/realm/workspace/Cocoa Release Installation Examples/binding/swift/method/dynamic/platform/osx/realm-cocoa/examples/installation/osx/swift-3.0/DynamicExample/../../../realm-swift-latest/osx/swift-3.0/RealmSwift.framework/Modules/RealmSwift.swiftmodule/x86_64.swiftmodule

It looks like Xcode 8.2 with Swift 3.0.2 is being used to build the example, but something is pulling in the Swift 3.0.0 version of the framework.

[bdash]

The Xcode projects in question hard-code the swift-3.0 framework path in their framework search paths. We need to update the version specified in the project and/or explicitly specify which version of Xcode the CI job uses.