configure: Relax check for libseccomp

All major distributions do support libseccomp version >= 2.3.0, so there
is no need to special-case on various architectures any longer.

Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <20190404183923.GA22347@ls3530.dellerweb.de>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Eduardo Otubo <otubo@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>