Move TLS 1.3 client hello writing to new TLS 1.2 and 1.3 client file

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 6c3d7fd..df7f170 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -99,6 +99,7 @@
     net_sockets.c
     ssl_cache.c
     ssl_ciphersuites.c
+    ssl_client.c
     ssl_cookie.c
     ssl_msg.c
     ssl_ticket.c