samba: upgrade to 3.6.24

Upgrade samba to latest 3.6.x version.

* remove PR
* remove backport CVE patches
* update 4 patches: documentation.patch, documentation2.patch, undefined-symbols.patch
  and bug_387266_upstream_4104_mention-kerberos-in-smbspool-manpage.patch

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>