Delete unused vsync related code from the OGL pipeline on macOS

During developments of the early version of java FX, some code was added to the OGL and D3D pipelines to support vsync drawing. It is not accessible via public API, but only via com.sun.java.swing.SwingUtilities3 class. Implementations of this feature were done on Windows and Linux, but on macOS some stubs were implemented only(copied from windows), but it is never functional.