Update module with host_cross_supported

Bug: 353739440

Test: m rust
Change-Id: I8d6f5bfc5665449f8307ca400985027365435fdc
diff --git a/Android.bp b/Android.bp
index 6cccf85..03e4a79 100644
--- a/Android.bp
+++ b/Android.bp
@@ -22,6 +22,7 @@
 
 rust_library_host {
     name: "libsynstructure",
+    host_cross_supported: false,
     crate_name: "synstructure",
     cargo_env_compat: true,
     cargo_pkg_version: "0.12.6",