[unity] Fixed a build error (build to platform only) in 'Spine Examples' after package.json structures and asmdef files have been added.

spine-unity/Assets/Spine Examples/Scripts/Sample Components/SkeletonUtility Modules/Editor/spine-unity-examples-editor.asmdef

@@ -0,0 +1,18 @@
+{
+    "name": "spine-unity-examples-editor",
+    "references": [
+        "spine-unity",
+        "spine-unity-examples"
+    ],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

spine-unity/Assets/Spine Examples/Scripts/Sample Components/SkeletonUtility Modules/Editor/spine-unity-examples-editor.asmdef.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 39599136c72c0b64b925d3ff2885aecb
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: