build: remove obsolete LIBVIRT_SANDBOX_GETTEXT call
build: remove obsolete LIBVIRT_SANDBOX_GETTEXT call

This file was removed in

  commit a5f59a37dd9473d4acb39f23f8261fa99af0f84b
  Author: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>
  Date:   Mon Aug 19 19:15:37 2019 +0100

    po: provide custom make rules for po file management

Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

libvirt/libvirt-sandbox,libvirt/libvirt-sandbox,libvirt/libvirt-sandbox