Fix tun2socks compile script to link with -lpthread

compile-tun2sock.sh

@@ -119,4 +119,4 @@ for f in $SOURCES; do
     OBJS=( "${OBJS[@]}" "${obj}" )
 done
 
-"${CC}" ${LDFLAGS} "${OBJS[@]}" -o $OUTDIR/tun2socks -lrt
+"${CC}" ${LDFLAGS} "${OBJS[@]}" -o $OUTDIR/tun2socks -lrt -lpthread