BUILD: ssl: fix two remaining occurrences of #if USE_OPENSSL

One was in backend.c and the other one in hlua.c. No other candidate
was found with "git grep '^#if\s*USE'". It's worth noting that 3
other such tests exist for SSL_OP_NO_{SSLv3,TLSv1_1,TLSv1_2} but
that these ones are properly set to 0 in openssl-compat.h when not
defined.

(cherry picked from commit b131049eb5ba5b0e7c02eea10ce9763da4428abe)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/src/backend.c b/src/backend.c
index b38c11c..778df1e 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -1679,7 +1679,7 @@
 		}
 	}
 
-#if USE_OPENSSL && (defined(OPENSSL_IS_BORINGSSL) || (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L))
+#if defined(USE_OPENSSL) && (defined(OPENSSL_IS_BORINGSSL) || (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L))
 
 	if (!reuse && cli_conn && srv && srv_conn->mux &&
 	    (srv->ssl_ctx.options & SRV_SSL_O_EARLY_DATA) &&