[1866] removed more now-removed files from Makefile.am.

src/lib/dns/Makefile.am

@@ -76,9 +76,6 @@ EXTRA_DIST += rdata/generic/minfo_14.cc
 EXTRA_DIST += rdata/generic/minfo_14.h
 EXTRA_DIST += rdata/generic/afsdb_18.cc
 EXTRA_DIST += rdata/generic/afsdb_18.h
-EXTRA_DIST += rdata/generic/any_255.txt
-EXTRA_DIST += rdata/generic/axfr_252.txt
-EXTRA_DIST += rdata/generic/ixfr_251.txt
 EXTRA_DIST += rdata/hs_4/a_1.cc
 EXTRA_DIST += rdata/hs_4/a_1.h
 EXTRA_DIST += rdata/in_1/a_1.cc