Added getNativePath() method to get the OS version of a virtual path.

source/mijin/virtual_filesystem/stacked.cpp

@@ -90,6 +90,19 @@ FileInfo StackedFileSystemAdapter::getFileInfo(const fs::path& file)
     return {};
 }
 
+Optional<fs::path> StackedFileSystemAdapter::getNativePath(const fs::path& file)
+{
+    for (auto& adapter : adapters_)
+    {
+        Optional<fs::path> result = adapter->getNativePath(file);
+        if (!result.empty())
+        {
+            return result;
+        }
+    }
+    return NULL_OPTIONAL;
+}
+
 StreamError StackedFileSystemAdapter::open(const fs::path& path, FileOpenMode mode, std::unique_ptr<Stream>& outStream)
 {
     for (auto& adapter : adapters_)