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.
diff --git a/src/hlua.c b/src/hlua.c
index 7b28088..039ebec 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -10952,7 +10952,7 @@
struct hlua_function *fcn;
struct hlua_reg_filter *reg_flt;
-#if USE_OPENSSL
+#if defined(USE_OPENSSL)
/* Initialize SSL server. */
if (socket_ssl->xprt->prepare_srv) {
int saved_used_backed = global.ssl_used_backend;