Add in ext4 support for ASEC containers

Now forward locked applications will be in ASEC containers both internal
to the system and externally.

This change adds support for putting applications in ext4-based ASECs.

Change-Id: I8d6765b72dd2606e429c067b47a2dbcaa8bef37d
diff --git a/Asec.h b/Asec.h
index 136ad3b..dd64fd0 100644
--- a/Asec.h
+++ b/Asec.h
@@ -33,6 +33,7 @@
     unsigned char c_chain;
 
 #define ASEC_SB_C_OPTS_NONE 0
+#define ASEC_SB_C_OPTS_EXT4 1
     unsigned char c_opts;
 
 #define ASEC_SB_C_MODE_NONE 0