Rename Magenta to Zircon

Change-Id: I081895ef3131d4232af21144dea89190d270a8ab
diff --git a/BUILD.gn b/BUILD.gn
index d114d89..d24babf 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -73,7 +73,7 @@
 
   deps = [
     ":liblua",
-    "//magenta/third_party/ulib/linenoise",
+    "//zircon/third_party/ulib/linenoise",
   ]
 
   defines = [