[PATCH] Fix #ifdef check for older openssl versions

[Adam Kent]

Small compile fix for older versions of openssl that do not have SHA256 support
and hence do not define OPENSSL_NO_SHA256.

  src/crypto/tls_openssl.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/crypto/tls_openssl.c b/src/crypto/tls_openssl.c
index 276d650..490c912 100644
--- a/src/crypto/tls_openssl.c
+++ b/src/crypto/tls_openssl.c
@@ -716,7 +716,7 @@ void * tls_init(const struct tls_config *conf)
  #endif /* CONFIG_FIPS */
                 SSL_load_error_strings();
                 SSL_library_init();
-#ifndef OPENSSL_NO_SHA256
+#if (OPENSSL_VERSION_NUMBER >= 0x0090800fL) && !defined(OPENSSL_NO_SHA256)
                 EVP_add_digest(EVP_sha256());
  #endif /* OPENSSL_NO_SHA256 */
                 /* TODO: if /dev/urandom is available, PRNG is seeded