Unbreak build with opaque DH in LibreSSL 3.5.

Index: src/h323ep.cxx
--- src/h323ep.cxx.orig
+++ src/h323ep.cxx
@@ -439,7 +439,7 @@ PBoolean H323_TLSContext::SetDHParameters(const PBYTEA
   BIGNUM* g = BN_bin2bn(dh_g, dh_g.GetSize(), NULL);
   if (p != NULL && g != NULL)
   {
-#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || defined(LIBRESSL_VERSION_NUMBER)
+#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
     dh->p = p;
     dh->g = g;
 #else
