Support building all variants.

Bug: 143217452
Test: cd external/rust; mma; atest in all TEST_MAPPING subdirs
Change-Id: I1bb20a6a63b49b3caf2a3603fe051f918f32e664
diff --git a/Android.bp b/Android.bp
index 1c74018..2c08732 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,6 +1,6 @@
 // This file is generated by cargo2android.py.
 
-rust_library_host_rlib {
+rust_library_host {
     name: "liblibloading",
     crate_name: "libloading",
     srcs: ["src/lib.rs"],