onnxruntime

0770cf36 - Remove C# SessionOptions.RegisterCustomOpsUsingFunction. (#15754)

Remove C# SessionOptions.RegisterCustomOpsUsingFunction. (#15754) Symbol visibility from DllImport is inconsistent across platforms resulting in the symbol not necessarily being visible to ORT native code that tries to look it up by name. Best solution is to use DllImport to load the library and to call the registration function directly. That requires the native SessionOptions handle and OrtApiBase struct. We could either make those public, or provide a helper where the user passes in a delegate from their DllImport. Can add when needed.