haproxy: Update HAProxy to v2.1.2

- Major version jump from v2.0 to v2.1
- Update haproxy download URL and hash
- Add new patches (see https://www.haproxy.org/bugs/bugs-2.1.2.html)
- Stop building LUA 5.3 in the haproxy build-process and use liblua5.3 as a dependency instead

Signed-off-by: Christian Lachner <gladiac@gmail.com>

net/haproxy/patches/004-MINOR-ssl-Remove-unused-variable-need_out.patch

@@ -0,0 +1,39 @@
+commit fbe15b7184da09c0d71051bf3978540f63aba5cc
+Author: Olivier Houchard <cognet@ci0.org>
+Date:   Sun Jan 5 16:45:14 2020 +0100
+
+    MINOR: ssl: Remove unused variable "need_out".
+    
+    The "need_out" variable was used to let the ssl code know we're done
+    reading early data, and we should start the handshake.
+    Now that the handshake function is responsible for taking care of reading
+    early data, all that logic has been removed from ssl_sock_to_buf(), but
+    need_out was forgotten, and left. Remove it know.
+    This patch was submitted by William Dauchy <w.dauchy@criteo.com>, and should
+    fix github issue #434.
+    This should be backported to 2.0 and 2.1.
+    
+    (cherry picked from commit 7f4f7f140f6b03b61d1b38260962db235c42c121)
+    Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
+
+diff --git a/src/ssl_sock.c b/src/ssl_sock.c
+index 7c62299a0..1fac2d905 100644
+--- a/src/ssl_sock.c
++++ b/src/ssl_sock.c
+@@ -6385,7 +6385,6 @@ static size_t ssl_sock_to_buf(struct connection *conn, void *xprt_ctx, struct bu
+ 	 * EINTR too.
+ 	 */
+ 	while (count > 0) {
+-		int need_out = 0;
+ 
+ 		try = b_contig_space(buf);
+ 		if (!try)
+@@ -6443,8 +6442,6 @@ static size_t ssl_sock_to_buf(struct connection *conn, void *xprt_ctx, struct bu
+ 			/* otherwise it's a real error */
+ 			goto out_error;
+ 		}
+-		if (need_out)
+-			break;
+ 	}
+  leave:
+ 	return done;