Link to libsnapshot_cow where libsnapshot is linked. am: 420bed506f

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1433515

Change-Id: I993af5380c8042cd1fb91b233cb914164cd90901
diff --git a/Android.bp b/Android.bp
index 28e1bab..c5e66e3 100644
--- a/Android.bp
+++ b/Android.bp
@@ -199,6 +199,7 @@
         "libgsi",
         "libpayload_consumer",
         "libsnapshot",
+        "libsnapshot_cow",
         "update_metadata-protos",
     ],
     shared_libs: [