Revert "fix for #4534, find xcode without spotlight"

[jpsim]

Reverts #4536

This was causing issues both when running on CI and locally. See https://ci.realm.io/job/objc_osx/1875/console and https://ci.realm.io/job/objc_ios/1857/console for examples.

Fails with the following error message:

Check dependencies
2017-01-18 13:07:51.435 xcodebuild[41326:920235] Error Domain=IDETestOperationsObserverErrorDomain Code=3 "Test operation was canceled. If you believe this error represents a bug, please attach the log file at /Users/jp/Projects/realm-cocoa/build/DerivedData/Realm/Logs/Test/F22480B2-1F81-4DD6-A0B4-FE5625567132/Session-ObjectServerTests-2017-01-18_130617-oP0uDI.log" UserInfo={NSLocalizedDescription=Test operation was canceled. If you believe this error represents a bug, please attach the log file at /Users/jp/Projects/realm-cocoa/build/DerivedData/Realm/Logs/Test/F22480B2-1F81-4DD6-A0B4-FE5625567132/Session-ObjectServerTests-2017-01-18_130617-oP0uDI.log}
“Use Legacy Swift Language Version” (SWIFT_VERSION) is required to be configured correctly for targets which use Swift. Use the [Edit > Convert > To Current Swift Syntax…] menu to choose a Swift version or use the Build Settings editor to configure the build setting directly.
warning: no umbrella header found for target 'RealmSwift', module map will not be generated

[jpsim]

FYI @larkost