src: make header file self-contained

Make node_crypto_clienthello-inl.h self-contained.

PR-URL: #16518
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: joyeecheung

src/node_crypto_clienthello-inl.h

@@ -24,6 +24,7 @@
 
 #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 
+#include "node_crypto_clienthello.h"
 #include "util.h"
 #include "util-inl.h"