Support building all variants.

Bug: 143217452
Test: cd external/rust; mma; atest in all TEST_MAPPING subdirs
Change-Id: I9046879ca3bf0b44c312cc4d0bb1818c7962525b
diff --git a/Android.bp b/Android.bp
index a89e1f5..f4f248e 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: "libregex_syntax",
     crate_name: "regex_syntax",
     srcs: ["src/lib.rs"],