[unity] minor cleanup, removed meta files of no longer existing directories.

spine-unity/Assets/Spine/Editor/spine-unity/Modules/SkeletonGraphic.meta

@@ -1,9 +0,0 @@
-fileFormatVersion: 2
-guid: 7a4120eda5e72634b8ea086a00778669
-folderAsset: yes
-timeCreated: 1527569450
-licenseType: Free
-DefaultImporter:
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

spine-unity/Assets/Spine/Editor/spine-unity/Modules/SkeletonGraphic/Editor.meta

@@ -1,9 +0,0 @@
-fileFormatVersion: 2
-guid: 78bba472871bc624f8930d51dea6dd3d
-folderAsset: yes
-timeCreated: 1455570938
-licenseType: Free
-DefaultImporter:
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

spine-unity/Assets/Spine/Editor/spine-unity/SkeletonUtility.meta

@@ -1,9 +0,0 @@
-fileFormatVersion: 2
-guid: 88e9a484884f9cb498c122a17ea0b4e5
-folderAsset: yes
-timeCreated: 1527569561
-licenseType: Free
-DefaultImporter:
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

spine-unity/Assets/Spine/Editor/spine-unity/SkeletonUtility/Editor.meta

@@ -1,5 +0,0 @@
-fileFormatVersion: 2
-guid: a751a9d1e3e26d64d997b66a781df8e9
-folderAsset: yes
-DefaultImporter:
-  userData: