Register new snapshots

Understand 'pkgid' in stage0. As a bonus, the snapshot now contains now metadata
(now that those changes have landed), and the snapshot download is half as large
as it used to be!

src/libsyntax/lib.rs

@@ -13,13 +13,7 @@
  *  macros.
  */
 
-#[pkgid="syntax#0.9-pre"];
-// NOTE: remove after the next snapshot
-#[link(name = "syntax",
-       package_id = "syntax",
-       vers = "0.9-pre",
-       uuid = "9311401b-d6ea-4cd9-a1d9-61f89499c645")];
-
+#[pkgid = "syntax#0.9-pre"];
 #[license = "MIT/ASL2"];
 #[crate_type = "dylib"];
 #[crate_type = "rlib"];