Patch to add custom field in User module

from __future__ import unicode_literals
import frappe
from frappe.custom.doctype.custom_field.custom_field import create_custom_fields

def execute():
        make_custom_fields()

def make_custom_fields():
        user_fields = [
                dict(   fieldname='prefix',
                        label='Prefix',
                        fieldtype='Select', options=' \nKSA-\nUAE-\nEGYPT-\nQATAR-\nGCC-\nEGP-',
                        insert_after='full_name'
                )
        ]

        custom_fields = {
                "User":user_fields
        }
        create_custom_fields(custom_fields)