bird: bump to 1.4.5

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Fix Quagga vtysh build against readline 6.3
Merge pull request #69 from stintel/bird_update

bird: bump to 1.4.5
Merge branch 'master' of git://github.com/openwrt-routing/packages