Support building all variants. am: 80f4b39003

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/proc-macro-hack/+/1356128

Change-Id: I6068215a8aebb82ebf048babf07f21fae3785f0d
diff --git a/Android.bp b/Android.bp
index c8253df..909135a 100644
--- a/Android.bp
+++ b/Android.bp
@@ -5,7 +5,7 @@
     crate_name: "proc_macro_hack",
     srcs: ["src/lib.rs"],
     edition: "2018",
-    rlibs: [
+    rustlibs: [
         "libproc_macro2",
         "libquote",
         "libsyn",