put dnsdist.1 in rpm

Author: Peter van Dijk

pdns.spec

@@ -70,3 +70,4 @@ These are the tools
 "/usr/man/man8/dnsscope.8"
 "/usr/man/man8/dnswasher.8"
 "/usr/man/man1/dnstcpbench.1"
+"/usr/man/man1/dnsdist.1"