Fix platform dependent compilation for OSX (#96)

On macOS, we want the code blocks take effect in the Editor, regardless of the chosen build target. So in addition to `UNITY_STANDALONE_OSX`, we also have to check for `UNITY_EDITOR_OSX`.

And on Windows, we don't want these code blocks to take effect in the Editor, even though macOS has been selected as the build target. So we only should check for `UNITY_STANDALONE_OSX` when not running in the Editor.

Author: bclausdorff

Plugins/SimpleFileBrowser/Scripts/FileBrowser.cs

@@ -1070,7 +1070,7 @@ private void InitializeQuickLinks()
 				AddQuickLink( m_skin.DriveIcon, "Files", Application.persistentDataPath );
 #endif
 
-#if UNITY_STANDALONE_OSX
+#if UNITY_EDITOR_OSX || ( !UNITY_EDITOR && UNITY_STANDALONE_OSX )
 				// Add a quick link for user directory on Mac OS
 				string userDirectory = Environment.GetFolderPath( Environment.SpecialFolder.MyDocuments );
 				if( !string.IsNullOrEmpty( userDirectory ) )
@@ -1083,7 +1083,7 @@ private void InitializeQuickLinks()
 			{
 				QuickLink quickLink = quickLinks[i];
 				string quickLinkPath = Environment.GetFolderPath( quickLink.target );
-#if UNITY_STANDALONE_OSX
+#if UNITY_EDITOR_OSX || ( !UNITY_EDITOR && UNITY_STANDALONE_OSX )
 				// Documents folder must be appended manually on Mac OS
 				if( quickLink.target == Environment.SpecialFolder.MyDocuments && !string.IsNullOrEmpty( quickLinkPath ) )
 					quickLinkPath = Path.Combine( quickLinkPath, "Documents" );
@@ -1198,7 +1198,7 @@ private void RefreshDriveQuickLinks()
 				if( string.IsNullOrEmpty( drives[i] ) )
 					continue;
 
-#if UNITY_STANDALONE_OSX
+#if UNITY_EDITOR_OSX || ( !UNITY_EDITOR && UNITY_STANDALONE_OSX )
 				// There are a number of useless drives listed on Mac OS, filter them
 				if( drives[i] == "/" )
 				{