expose the ed448 nid (#4717)
we already did all the conditional binding, but forgot to actually
expose it.
diff --git a/src/_cffi_src/openssl/nid.py b/src/_cffi_src/openssl/nid.py
index bf445aa..4117b93 100644
--- a/src/_cffi_src/openssl/nid.py
+++ b/src/_cffi_src/openssl/nid.py
@@ -97,6 +97,7 @@
static const int NID_X25519;
static const int NID_X448;
static const int NID_ED25519;
+static const int NID_ED448;
static const int NID_wap_wsg_idm_ecid_wtls1;
static const int NID_wap_wsg_idm_ecid_wtls3;
static const int NID_wap_wsg_idm_ecid_wtls4;