Version 4.0 fails to build with LibreSSL

[Sp1l]

When building PowerDNS with LibreSSL as provider for libcrypto/libssl

This is due to LibreSSL defining OPENSSL_VERSION_NUMBER as 0x20000000L.

This is now fixed for @HardenedBSD with HardenedBSD/hardenedbsd-ports@e477f2b

opensslsigners.cc:229:3: error: use of undeclared identifier 'RSA_get0_key'
  RSA_get0_key(d_key, &n, &e, &d);
  ^
opensslsigners.cc:230:3: error: use of undeclared identifier 'RSA_get0_factors'
  RSA_get0_factors(d_key, &p, &q);
  ^
opensslsigners.cc:231:3: error: use of undeclared identifier 'RSA_get0_crt_params'
  RSA_get0_crt_params(d_key, &dmp1, &dmq1, &iqmp);
  ^
opensslsigners.cc:698:3: error: use of undeclared identifier 'ECDSA_SIG_get0'
  ECDSA_SIG_get0(signature, &pr, &ps);
  ^
opensslsigners.cc:743:3: error: use of undeclared identifier 'ECDSA_SIG_set0'
  ECDSA_SIG_set0(sig, r, s);
  ^
11 errors generated.

Patching is simple enough

--- pdns/opensslsigners.cc.orig 2016-07-29 14:32:32 UTC
+++ pdns/opensslsigners.cc
@@ -12,7 +12,7 @@
 #include "opensslsigners.hh"
 #include "dnssecinfra.hh"

-#if OPENSSL_VERSION_NUMBER < 0x1010000fL
+#if OPENSSL_VERSION_NUMBER < 0x1010000fL || defined(LIBRESSL_VERSION_NUMBER)
 /* OpenSSL < 1.1.0 needs support for threading/locking in the calling application. */
 static pthread_mutex_t *openssllocks;

[Sp1l]

Should've checked first... 115f658 fixes the issue.

The changes to dns_random.cc don't seem to be neccessary.