Update wayland.xml to version 1.16.0

Now that we've stopped including the system libwayland protocol headers, i.e.
wayland-client.h and wayland-server.h, it should be safe to update the protocol
definitions to the latest version.

Note that this just updates the protocol definition, the implementations for
the various interfaces are still using the old versions.

Change-Id: I961e762553756e11e4c5b33c74101f0c16661232
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

src/3rdparty/wayland/protocols/qt_attribution.json

@@ -27,14 +27,14 @@ Copyright © 2015 Jonas Ådahl"
 
         "Description": "Wayland is a protocol for a compositor to talk to its clients.",
         "Homepage": "https://wayland.freedesktop.org",
-        "Version": "1.6.1",
-        "DownloadLocation": "https://cgit.freedesktop.org/wayland/wayland/tag/?id=1.6.1",
-        "LicenseId": "HPND",
-        "License": "HPND License",
-        "LicenseFile": "HPND_LICENSE.txt",
+        "Version": "1.16.0",
+        "DownloadLocation": "https://gitlab.freedesktop.org/wayland/wayland/raw/1.16.0/protocol/wayland.xml",
+        "LicenseId": "MIT",
+        "License": "MIT License",
+        "LicenseFile": "MIT_LICENSE.txt",
         "Copyright": "Copyright © 2008-2011 Kristian Høgsberg
-    Copyright © 2010-2011 Intel Corporation
-    Copyright © 2012-2013 Collabora, Ltd."
+Copyright © 2010-2011 Intel Corporation
+Copyright © 2012-2013 Collabora, Ltd."
     },
 
     {