quagga: upgrade 0.99.23 -> 0.99.24.1

Remove "--enable-ipv6" to avoid build warning like this:
WARNING: QA Issue: quagga: configure was passed unrecognised options:
--enable-ipv6 [unknown-configure-option]

Signed-off-by: Li Xin <lixin.fnst@cn.fujitsu.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>