Backported from X.org:

commit 39ce5f1544029412f4060f3e89ce1d87222ef42b
Author: Adam Jackson <ajax@nwnk.net>
Date:   Fri Jan 6 17:05:26 2006 +0000

    Remove unused X11R4 DDX compatibility function miClipNotify.
Backported-to-NX-by: Mihai Moldovan <ionic@ionic.de>

Attributes GH PR #650: https://github.com/ArcticaProject/nx-libs/pull/650

I left out glx changes to miinitext.c for now.

Attributes GH PR #649: https://github.com/ArcticaProject/nx-libs/pull/649

Attributes GH PR #660: https://github.com/ArcticaProject/nx-libs/pull/660

Fixes: ArcticaProject/nx-libs#653
Fixes: ArcticaProject/nx-libs#639

hw/nxagent/: Stop using non-portable '__progname', set up our own 'nxagentProgName' instead and pass it around where needed.

Fixes ArcticaProject/nx-libs#639

Fixes ArcticaProject/nx-libs#639.

Fixes ArcticaProject/nx-libs#653.

Attribiutes GH PR #647: https://github.com/ArcticaProject/nx-libs/pull/647

Attributes GH PR #646: https://github.com/ArcticaProject/nx-libs/pull/646

Attributes GH PR #645: https://github.com/ArcticaProject/nx-libs/pull/645

Attributes GH PR #658: https://github.com/ArcticaProject/nx-libs/pull/658

Fixes: ArcticaProject/nx-libs#657

Fixes ArcticaProject/nx-libs#657.

Attributes GH PR #644: https://github.com/ArcticaProject/nx-libs/pull/644

According to the C standard these are not equivalent. However, the
same change has been done in Xorg upstream. Plus these functions are
not called with parameters anywhere so we should be fine.

Besides, include/{extinit.h,XIstubs.h} always had the "void".