Use Magenta's copy of linenoise instead of third_party/linenoise

US-147

Change-Id: I2b79a92b3101dfdc71c133b13a2612c0c577d28d
diff --git a/BUILD.gn b/BUILD.gn
index dcbac98..d347946 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -59,7 +59,7 @@
 
   deps = [
     ":liblua",
-    "//third_party/linenoise",
+    "//magenta/third_party/ulib/linenoise",
   ]
 
   defines = [