[unity] Corrected #if guards for Unity 5.x compatibility before Unity added SpriteMasks. See #941.

spine-unity/Assets/Spine/Editor/spine-unity/Editor/SkeletonRendererInspector.cs

@@ -34,7 +34,7 @@
 #define NO_PREFAB_MESH
 #endif
 
-#if UNITY_2017_OR_NEWER
+#if UNITY_2017_1_OR_NEWER
 #define BUILT_IN_SPRITE_MASK_COMPONENT
 #endif
 

spine-unity/Assets/Spine/Editor/spine-unity/Editor/SpineMaskUtilities.cs

@@ -44,7 +44,7 @@
 #define NEWHIERARCHYWINDOWCALLBACKS
 #endif
 
-#if UNITY_2017_OR_NEWER
+#if UNITY_2017_1_OR_NEWER
 #define BUILT_IN_SPRITE_MASK_COMPONENT
 #endif
 

spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs

@@ -32,7 +32,7 @@
 #define NEW_PREFAB_SYSTEM
 #endif
 
-#if UNITY_2017_OR_NEWER
+#if UNITY_2017_1_OR_NEWER
 #define BUILT_IN_SPRITE_MASK_COMPONENT
 #endif