[master] Add missing entries to src/lib/dns/Makefile.am to fix distcheck errors

src/lib/dns/Makefile.am

@@ -30,6 +30,8 @@ EXTRA_DIST += rdata/generic/dnskey_48.cc
 EXTRA_DIST += rdata/generic/dnskey_48.h
 EXTRA_DIST += rdata/generic/ds_43.cc
 EXTRA_DIST += rdata/generic/ds_43.h
+EXTRA_DIST += rdata/generic/hinfo_13.cc
+EXTRA_DIST += rdata/generic/hinfo_13.h
 EXTRA_DIST += rdata/generic/mx_15.cc
 EXTRA_DIST += rdata/generic/mx_15.h
 EXTRA_DIST += rdata/generic/naptr_35.cc