haproxy:
 * bump version to 1.4.23, security fix, refs #2072
 * add patch disabling epoll for kernels <= 2.6.19, epoll doesn't work on fritz!boxes with these kernel versions
 * use linux2628 as TARGET for all boxes with kernel >= 2.6.28 (enables epoll, tproxy and splice)
 * add missing CHANGELOG entry
 * add missing MD5 checksum
 * minor makefile cleanups
 * compile-tested only
 * refs #1771
 * refs #2088


git-svn-id: file:///var/svn/freetz/trunk@10444 149334a1-2f27-0410-a3b9-fc62619ac1e6