Support building fsverity as a host binary

Test: build and run locally
Bug: 112039386
Change-Id: I73be3ffe5e09091eaf40e23e335aad271ad3fde0
diff --git a/Android.bp b/Android.bp
index e313829..8b9f1e6 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,5 +1,6 @@
 cc_binary {
     name: "fsverity",
+    host_supported: true,
     shared_libs: ["libcrypto"],
     cflags: [
         "-Wall",