Support building all variants. am: 68718733e6 am: f46b826195 am: bd4244f8ea

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-util/+/1356174

Change-Id: I1a19273f69b6677d7efdf2bb224c3e18c8dce94d
diff --git a/Android.bp b/Android.bp
index bc56973..24754af 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,6 +1,6 @@
 // This file is generated by cargo2android.py --run --device --features channel,default,io,memchr,sink.
 
-rust_library_rlib {
+rust_library {
     name: "libfutures_util",
     host_supported: true,
     crate_name: "futures_util",
@@ -24,7 +24,7 @@
         "slab",
         "std",
     ],
-    rlibs: [
+    rustlibs: [
         "libfutures_channel",
         "libfutures_core",
         "libfutures_io",