LibreSSL doesn't define OPENSSL_VERSION, use LIBRESSL_VERSION_TEXT instead

src/init.cpp

@@ -1034,8 +1034,10 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
 
 #if (OPENSSL_VERSION_NUMBER < 0x10100000L)
     LogPrintf("Using OpenSSL version %s\n", SSLeay_version(SSLEAY_VERSION));
-#else
+#elif defined OPENSSL_VERSION
     LogPrintf("Using OpenSSL version %s\n", OpenSSL_version(OPENSSL_VERSION));
+#elif defined LIBRESSL_VERSION_TEXT
+    LogPrintf("Using %s\n", LIBRESSL_VERSION_TEXT);
 #endif
 
 #ifdef ENABLE_WALLET