Mark libbz as recovery_available for update_engine_sideload

Test: build update_engine_sideload
Change-Id: I5600439abeb911a5b62a4ff2ef3e6b05fc385797
diff --git a/Android.bp b/Android.bp
index 730883d..8092f56 100644
--- a/Android.bp
+++ b/Android.bp
@@ -15,6 +15,7 @@
 cc_library {
     name: "libbz",
     host_supported: true,
+    recovery_available: true,
     arch: {
         arm: {
             // measurements show that the ARM version of ZLib is about x1.17 faster