pptpd: Bump to version to 1.4.0 (fixes #2427)

git-svn-id: file:///var/svn/freetz/trunk@11904 149334a1-2f27-0410-a3b9-fc62619ac1e6
7170: Add kernel patch to fix reboots with high wlan traffic (refs #2003)
 - patch by dneuge
 

git-svn-id: file:///var/svn/freetz/trunk@11905 149334a1-2f27-0410-a3b9-fc62619ac1e6