Exclude the "tools" from building and installing.

--- bin/Makefile.am.orig	2020-04-30 07:10:53 UTC
+++ bin/Makefile.am
@@ -1,4 +1,4 @@
-SUBDIRS = named rndc dig delv dnssec tools nsupdate check confgen tests plugins
+SUBDIRS = named rndc tools check confgen tests plugins
 
 if HAVE_PKCS11
 SUBDIRS += pkcs11
--- bin/tools/Makefile.am.orig	2020-04-30 07:08:39 UTC
+++ bin/tools/Makefile.am
@@ -8,15 +8,10 @@ LDADD =				\
 	$(LIBISC_LIBS)		\
 	$(LIBDNS_LIBS)
 
-bin_PROGRAMS =			\
-	arpaname		\
-	named-rrchecker		\
-	mdig
+bin_PROGRAMS =
 
-sbin_PROGRAMS =			\
-	named-journalprint	\
-	nsec3hash
+sbin_PROGRAMS =
 
 mdig_CPPFLAGS =			\
 	$(AM_CPPFLAGS)		\
 	$(LIBBIND9_CFLAGS)