Only select the "tools" part of bind for building.

--- Makefile.am.orig	2020-06-06 05:02:12 UTC
+++ Makefile.am
@@ -8,8 +8,6 @@ CLEANFILES = bind.keys.h
 bind.keys.h: bind.keys Makefile
 	${PERL} ${top_srcdir}/util/bindkeys.pl ${top_srcdir}/bind.keys > $@
 
-dist_sysconf_DATA = bind.keys
-
 .PHONY: doc
 
 EXTRA_DIST = 			\
--- bin/Makefile.am.orig	2020-06-06 05:02:12 UTC
+++ bin/Makefile.am
@@ -1,4 +1,4 @@
-SUBDIRS = named rndc dig delv dnssec tools nsupdate check confgen tests plugins
+SUBDIRS = dig delv dnssec tools nsupdate
 
 if HAVE_PKCS11
 SUBDIRS += pkcs11