sadb_x_policy_reserved -> sadb_x_policy_flags

[Andrew Cagney]

I just noticed this rename when building libreswan against 10.

Can I suggest adding:
  #define sadb_x_policy_flags sadb_x_policy_flags
to signal this change to consumers?  Or perhaps there is some other
way to detect if this change is present?

As an aside, FreeBSD hid their rename by defining:
  #define sadb_x_policy_reserved sadb_x_policy_scope
from my pov that is less interesting.

Andrew

PS: the code is dumping structures