Revert "adds OR SWIFT_PACKAGE to avoid a breaking change"

This reverts commit f36c766.

Author: OhKanghoon

Sources/Swift/FlexLayout.swift

@@ -13,7 +13,7 @@
 // Created by Luc Dion on 2017-06-19.
 
 import UIKit
-#if FLEXLAYOUT_SWIFT_PACKAGE || SWIFT_PACKAGE
+#if FLEXLAYOUT_SWIFT_PACKAGE
 import FlexLayoutYogaKit
 #endif
 

Sources/Swift/Impl/FlexLayout+Enum.swift

@@ -14,7 +14,7 @@
 
 import UIKit
 
-#if FLEXLAYOUT_SWIFT_PACKAGE || SWIFT_PACKAGE
+#if FLEXLAYOUT_SWIFT_PACKAGE
 import FlexLayoutYoga
 
 extension YGFlexDirection {

Sources/Swift/Impl/FlexLayout+Private.swift

@@ -7,7 +7,7 @@
 //
 
 import UIKit
-#if FLEXLAYOUT_SWIFT_PACKAGE || SWIFT_PACKAGE
+#if FLEXLAYOUT_SWIFT_PACKAGE
 import FlexLayoutYoga
 #endif
 

Sources/Swift/YGLayoutExtensions.swift

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-#if FLEXLAYOUT_SWIFT_PACKAGE || SWIFT_PACKAGE
+#if FLEXLAYOUT_SWIFT_PACKAGE
 import CoreGraphics
 import FlexLayoutYoga
 #endif

Sources/YogaKit/include/YogaKit/YGLayout+Private.h

@@ -6,7 +6,7 @@
  */
 
 #import "YGLayout.h"
-#if FLEXLAYOUT_SWIFT_PACKAGE || SWIFT_PACKAGE
+#if FLEXLAYOUT_SWIFT_PACKAGE
 #import <yoga/Yoga.h>
 #else
 #import "Yoga.h"

Sources/YogaKit/include/YogaKit/YGLayout.h

@@ -7,7 +7,7 @@
 
 #import <UIKit/UIKit.h>
 
-#if FLEXLAYOUT_SWIFT_PACKAGE || SWIFT_PACKAGE
+#if FLEXLAYOUT_SWIFT_PACKAGE
 #import <yoga/YGEnums.h>
 #import <yoga/Yoga.h>
 #import <yoga/YGMacros.h>