Fix proc-macro-hack/METADATA

Bug: 166324735
Test: make
Change-Id: I563019229c44af4ab2aa5fa77794176c84be0acb
diff --git a/METADATA b/METADATA
index 0fd8eb1..39647e9 100644
--- a/METADATA
+++ b/METADATA
@@ -6,8 +6,8 @@
     value: "https://crates.io/crates/proc-macro-hack"
   }
   url {
-    type: GIT
-    value: "https://github.com/dtolnay/proc-macro-hack"
+    type: ARCHIVE
+    value: "https://static.crates.io/crates/proc-macro-hack/proc-macro-hack-0.5.18.crate"
   }
   version: "0.5.18"
   license_type: NOTICE