Function ocl::ffi::clCreateContextFromType

pub unsafe extern "system" fn clCreateContextFromType(properties: *const isize,
                                                      device_type: u64,
                                                      pfn_notify: Option<extern fn(*const i8, *const c_void, usize, *mut c_void)>,
                                                      user_data: *mut c_void,
                                                      errcode_ret: *mut i32)
                                                      -> *mut c_void