MIDIDeviceController.h causes compilation errors when included in an external module

When you attempt to access MIDIDeviceController.h in your own project, it'll fail when you include it. This is the main error, while the other is a syntax error:

missing type specifier - int assumed. Note: C++ does not support default-int

Regression?: No
While this didn't occur in 4.13, it's due to the plugin in question being added in 4.14

1. Create a new C++ project
2. Add a new C++ class
3. In the projectname.build.cs file, add "MIDIDevice" as a public dependency
4. In the new C++ class, include the "MIDIDeviceController.h" file
5. Compile the project
   Result: The compile returns multiple errors located in MIDIDeviceController.h
   Expected: The compile succeeds