Fixes ArcticaProject/nx-libs#701

Attributes GH PR #695: https://github.com/ArcticaProject/nx-libs/pull/695

  Fixes ArcticaProject/nx-libs#694

Attributes GH PR #689: https://github.com/ArcticaProject/nx-libs/pull/689

nxagentHandleConfigureNotify() has an optimization that accumulates
ConfigureNotify events from the queue to only perform the changes of
the last ConfigureNotify event in the queue. But that code used to
ignore position changes and only adapt the new window position if the
last event happened to contain a position change.

This change ensures the latest position change - if any - found in the
queue will be applied after the accumulation.

Fixes: ArticaProject/nx-libs#688 (second part)

Was 0,0 on every call...

This is the preferred way. It ensures, that
a) the data is zeroed
b) a correct size in case xlib is changing the size of the structure in future releases

nxagentSetWMNormalHints was slightly adapted therefore

debian/rules: Highly enforce --no-parallel mode while Xserver is still on imake. Can be re-parallelized after autotools conversion.

Attributes GH PR #686: https://github.com/ArcticaProject/nx-libs/pull/686

Revert "debian/rules: Avoid dh_auto_build. It adds -Oline since 11.2 which let's make choke in nx-X11/ subdir on the Makefiles target. Reason unknown."

This reverts commit 94d77e27.

This reverts commit 190e3df4.

debian/rules: Drop override_dh_clean. Makefile (et al.) removal in nx-X11/ has now been moved to the distclean target.

debian/rules: Avoid dh_auto_build. It adds -Oline since 11.2 which let's make choke in nx-X11/ subdir on the Makefiles target. Reason unknown.

Makefile targets: Rewriting and consolidating the target structure for nx-X11/ subdir (except nx-X11/lib/).

Makefile: Don't do a parallel clean-up of nx-X11. We have seen failures and due to the upcoming switch to autotools, it is pointless to dive into fixing it in the Imakefile stack.

Attributes GH PR #676: https://github.com/ArcticaProject/nx-libs/pull/676

This utilizes IMAKE_DEFINES to pass down the value to UseTIRPC directly.

Fixes: ArcticaProject/nx-libs#665