`udpcksum' declared but not used in net/pipex.c, so kill it

Index: sys/net/pipex.c
===================================================================
RCS file: /cvs/src/sys/net/pipex.c,v
retrieving revision 1.116
diff -u -p -r1.116 pipex.c
--- sys/net/pipex.c     22 Jun 2020 09:38:15 -0000      1.116
+++ sys/net/pipex.c     30 Jun 2020 13:28:48 -0000
@@ -104,9 +104,6 @@ struct mbuf_queue pipexoutq = MBUF_QUEUE
 /* borrow an mbuf pkthdr field */
 #define ph_ppp_proto ether_vtag
 
-/* from udp_usrreq.c */
-extern int udpcksum;
-
 #ifdef PIPEX_DEBUG
 int pipex_debug = 0;           /* systcl net.inet.ip.pipex_debug */
 #endif

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