add SNI support in -V output

src/core/nginx.c

diff --git a/src/core/nginx.c b/src/core/nginx.c
index 29eee6a..2262087 100644
--- a/src/core/nginx.c
+++ b/src/core/nginx.c
@@ -239,6 +239,9 @@
 #ifdef NGX_COMPILER
             ngx_log_stderr(0, "built by " NGX_COMPILER);
 #endif
+#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
+            ngx_log_stderr(0, "TLS SNI support enabled");
+#endif
             ngx_log_stderr(0, "configure arguments:" NGX_CONFIGURE);
         }