fixed common/util.cpp to link against libressl

src/common/util.cpp

@@ -550,7 +550,7 @@ std::string get_nix_version_display_string()
       MCLOG_RED(el::Level::Warning, "global", "Running with glibc " << ver << ", hangs may occur - change glibc version if possible");
 #endif
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000
+#if OPENSSL_VERSION_NUMBER < 0x10100000 || defined(LIBRESSL_VERSION_TEXT)
     SSL_library_init();
 #else
     OPENSSL_init_ssl(0, NULL);