Removed obsolete symbols from comments.

src/common/filename.cpp

@@ -668,7 +668,7 @@ wxFileSystemObjectExists(const wxString& path, int flags)
     // Anything else must be a file (perhaps we should check for
     // FILE_ATTRIBUTE_REPARSE_POINT?)
     return acceptFile;
-#else // Non-MSW, non-OS/2
+#else // Non-MSW
     wxStructStat st;
     if ( !StatAny(st, strPath, flags) )
         return false;