Support building all variants.

Bug: 143217452
Test: cd external/rust; mma; atest in all TEST_MAPPING subdirs
Change-Id: I87050dc7f74ed7411207c571207562d7d7a9b374
diff --git a/Android.bp b/Android.bp
index 089a54a..10ee76b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,8 +1,9 @@
 // This file is generated by cargo2android.py.
 
-rust_library_host_rlib {
+rust_library {
     name: "librustc_hash",
     crate_name: "rustc_hash",
+    host_supported: true,
     srcs: ["src/lib.rs"],
     edition: "2015",
     features: [