[Swan-dev] testing build fails

[D. Hugh Redelmeier]

| From: D. Hugh Redelmeier <hugh at mimosa.com>
| 
| /source/lib/libswan/ike_alg_dh.c:337:13: error: ‘SEC_OID_CURVE25519’ undeclared here (not in a function)
|   .nss_oid = SEC_OID_CURVE25519,
| 
| On Fedora 28, this is defined in nss-util-devel-3.37.3-1.0.fc28.x86_64
| 
| How do we get it into the standard testing VMs?

The simplest stopgap solution is to add this to Makefile.inc.local in
the host's source directory (which happens to be the guests' /source
directory):
	USE_DH31=false

The right solution is to update the guest OS to something newer
(Fedora 28?).