Support building all variants.

Bug: 143217452
Test: cd external/rust; mma; atest in all TEST_MAPPING subdirs
Change-Id: I2aa828bdca03f8b00d73aca2191fdb3074c73091
diff --git a/Android.bp b/Android.bp
index 09d4e9d..3e66542 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: "libshlex",
     crate_name: "shlex",
     srcs: ["src/lib.rs"],