build: Mention use of asm in summary

laanwj · laanwj · commit 538cc0ca8b1c · 2017-08-28T11:19:56.000+02:00
diff --git a/configure.ac b/configure.ac
@@ -1297,6 +1297,7 @@ echo "  with zmq      = $use_zmq"
 echo "  with test     = $use_tests"
 echo "  with bench    = $use_bench"
 echo "  with upnp     = $use_upnp"
+echo "  use asm       = $use_asm"
 echo "  debug enabled = $enable_debug"
 echo "  werror        = $enable_werror"
 echo 
