Support building all variants. am: 25976a9047

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures/+/1356124

Change-Id: I27b4d4f138f78ea0217aa97061eb6fe86981c0d5
diff --git a/Android.bp b/Android.bp
index dd06860..6ccafbe 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,6 +1,6 @@
 // This file is generated by cargo2android.py --run --device.
 
-rust_library_rlib {
+rust_library {
     name: "libfutures",
     host_supported: true,
     crate_name: "futures",
@@ -14,7 +14,7 @@
         "futures-executor",
         "std",
     ],
-    rlibs: [
+    rustlibs: [
         "libfutures_channel",
         "libfutures_core",
         "libfutures_executor",