Unbreak build with opaque DH in LibreSSL 3.5.

Index: src/h235/h235support.cxx
--- src/h235/h235support.cxx.orig
+++ src/h235/h235support.cxx
@@ -55,7 +55,7 @@ extern "C" {
 #include <openssl/bn.h>
 };
 
-#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || defined(LIBRESSL_VERSION_NUMBER)
+#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
 
 inline void DH_get0_pqg(const DH *dh,
                  const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
