Fix lint in Xcode 7.2, it requires `-destination`

While `watchos` and `tvos` are fairly straightforward, I chose iPhone 4s
as destination for `ios` since it is seems like the most likely to
work with any version of Xcode at this point.

lib/cocoapods/validator.rb

@@ -699,11 +699,11 @@ module Pod
       command = %w(clean build -workspace App.xcworkspace -scheme App -configuration Release)
       case consumer.platform_name
       when :ios
-        command += %w(CODE_SIGN_IDENTITY=- -sdk iphonesimulator)
+        command += %w(CODE_SIGN_IDENTITY=- -sdk iphonesimulator) + ['-destination', 'name=iPhone 4s']
       when :watchos
-        command += %w(CODE_SIGN_IDENTITY=- -sdk watchsimulator)
+        command += %w(CODE_SIGN_IDENTITY=- -sdk watchsimulator) + ['-destination', 'name=Apple Watch - 38mm']
       when :tvos
-        command += %w(CODE_SIGN_IDENTITY=- -sdk appletvsimulator)
+        command += %w(CODE_SIGN_IDENTITY=- -sdk appletvsimulator) + ['-destination', 'name=Apple TV 1080p']
       end
 
       output, status = Dir.chdir(validation_dir) { _xcodebuild(command) }

spec/unit/validator_spec.rb

@@ -418,9 +418,9 @@ module Pod
         Executable.expects(:which).with('xcodebuild').times(4).returns('/usr/bin/xcodebuild')
         command = %w(clean build -workspace App.xcworkspace -scheme App -configuration Release)
         Executable.expects(:capture_command).with('xcodebuild', command, :capture => :merge).once.returns(['', stub(:success? => true)])
-        Executable.expects(:capture_command).with('xcodebuild', command + %w(CODE_SIGN_IDENTITY=- -sdk appletvsimulator), :capture => :merge).once.returns(['', stub(:success? => true)])
-        Executable.expects(:capture_command).with('xcodebuild', command + %w(CODE_SIGN_IDENTITY=- -sdk iphonesimulator), :capture => :merge).once.returns(['', stub(:success? => true)])
-        Executable.expects(:capture_command).with('xcodebuild', command + %w(CODE_SIGN_IDENTITY=- -sdk watchsimulator), :capture => :merge).once.returns(['', stub(:success? => true)])
+        Executable.expects(:capture_command).with('xcodebuild', command + %w(CODE_SIGN_IDENTITY=- -sdk appletvsimulator) + ['-destination', 'name=Apple TV 1080p'], :capture => :merge).once.returns(['', stub(:success? => true)])
+        Executable.expects(:capture_command).with('xcodebuild', command + %w(CODE_SIGN_IDENTITY=- -sdk iphonesimulator) + ['-destination', 'name=iPhone 4s'], :capture => :merge).once.returns(['', stub(:success? => true)])
+        Executable.expects(:capture_command).with('xcodebuild', command + %w(CODE_SIGN_IDENTITY=- -sdk watchsimulator) + ['-destination', 'name=Apple Watch - 38mm'], :capture => :merge).once.returns(['', stub(:success? => true)])
         validator.validate
       end