Don't make site.exp until "make check" is run; it needs adnshost.

ChangeLog

@@ -36,6 +36,9 @@
 	(valgrind.wrap): Use VALGRIND_FD, instead of hardcoding the value
 	in two places.  Changed the valgrind file descriptor to 21, which
 	is currently the highest reserved file descriptor.
+	(check_DATA): Was: noinst_DATA.   site.exp should not be built
+	until adnshost is built, and the other stuff in noinst_DATA was
+	also not needed until check time.
 
 	Don't log simple reverse lookup errors for localhost, since they
 	interfere with the test suite and are fairly common and harmless.