Stop including dnstap headers from <dns/dnstap.h>

The <fstrm.h> and <protobuf-c/protobuf-c.h> headers are only directly
included where used and we stopped exposing those headers from libdns
headers.

bin/named/server.c

@@ -20,6 +20,10 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#ifdef HAVE_DNSTAP
+#include <fstrm.h>
+#endif
+
 #include <isc/aes.h>
 #include <isc/app.h>
 #include <isc/attributes.h>