Re-compile against ppp 2.4.6, Closes: #745770

debian/control

@@ -7,7 +7,7 @@ Build-Depends: debhelper (>= 9),
     automake,
     hardening-wrapper,
     libwrap0-dev,
-    ppp-dev,
+    ppp-dev (>= 2.4.6-2~),
 Homepage: http://poptop.sourceforge.net/dox/
 
 Package: pptpd
@@ -15,7 +15,7 @@ Architecture: linux-any
 Depends: ${misc:Depends}, ${shlibs:Depends},
     bcrelay,
     netbase,
-    ppp,
+    ppp (>= 2.4.6-2~),
 Description: PoPToP Point to Point Tunneling Server
  This implements a Virtual Private Networking Server (VPN) that is
  compatible with Microsoft VPN clients. It allows Windows users to