Function fltk_sys::dialog::Fl_File_Chooser_set_callback

pub unsafe extern "C" fn Fl_File_Chooser_set_callback(
    self_: *mut Fl_File_Chooser, 
    cb: Option<unsafe extern "C" fn(arg1: *mut Fl_File_Chooser, arg2: *mut c_void)>, 
    d: *mut c_void
)