Repair for non-ECC OpenSSL.
Ifdef out the ECC parts when building with an OpenSSL that doesn't have
it.
diff --git a/sshconnect2.c b/sshconnect2.c
index 804194a..ba56f64 100644
--- a/sshconnect2.c
+++ b/sshconnect2.c
@@ -213,7 +213,9 @@
kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
+# ifdef OPENSSL_HAS_ECC
kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
+# endif
#endif
kex->kex[KEX_C25519_SHA256] = kexc25519_client;
kex->client_version_string=client_version_string;