Older autoconf versions - as used on SLE 11 and RHEL 6 - choke if
aclocal is passed an include directory that does not exist.

Instead of removing the option from the aclocal call, let's keep it and
just use an empty directory for now. Maybe we'll actually use it at a
later time.

debian/patches: Add 2004_enforce-lpthread.patch. On Debian, enforce -lpthread when building nxcomp. This is a nasty work around for a missing symbols issue that needs to get addressed otherwise in later release.

nx-libs.spec: Dropping nxdialog files from installation for now when building RPMs. Postponing nxdialog integration with RPM packaging for now.

Attributes GH PR #789: https://github.com/ArcticaProject/nx-libs/pull/789
Approved by Ulrich Sibiller <uli42@gmx.de>, Fri, 01 Mar 2019 05:41:23 -0800

Attributes GH PR #767: https://github.com/ArcticaProject/nx-libs/pull/767

Agent PID 0 can be used for testing

By adding NX_CLIENT=<path to nxdialog> to the envrionment
certain actions in nx will open dialogs. If the options string contains
"menu=1" rootless windows will show a popup menu when the mouse hits
the center of the title bar offering session disconnect/terminatation.

Attributes GH PR #762: https://github.com/ArcticaProject/nx-libs/pull/762

Attributes GH PR #763: https://github.com/ArcticaProject/nx-libs/pull/763

Instead of using a pragma which will be valid for the whole file this
only affects the functions where it is actually required and supresses
"format string is not a string literal" warnings.

According to GCC documentation the second attribute parameter should
be 0:

"For functions where the arguments are not available to be checked
(such as vprintf), specify the third parameter as zero".

storage class specifier is deprecated and incompatible with C++17

Found via Travis CI

Attributes GH PR #788: https://github.com/ArcticaProject/nx-libs/pull/788

Attributes ArcticaProject/nx-libs#382

  commit cc5f09c86f7bea23b7546c3491b2c52ce8100a71
  Author: Alan Coopersmith <alan.coopersmith@oracle.com>
  Date:   Mon Jul 9 19:12:43 2012 -0700

    Use C99 designated initializers in various extension Replies
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Tested-by: Daniel Stone <daniel@fooishbar.org>

Attributes ArcticaProject/nx-libs#382

  commit cdf5bcd420e5bcf4a4a24a275d3133a4e16ce41e
  Author: Alan Coopersmith <alan.coopersmith@oracle.com>
  Date:   Mon Jul 9 19:12:42 2012 -0700

    Use calloc to zero fill buffers being allocated for replies & events

    Ensures padding bytes are zero-filled
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Tested-by: Daniel Stone <daniel@fooishbar.org>

Attributes ArcticaProject/nx-libs#382

Fixes ArcticaProject/nx-libs#399

reflect the version of libX11 we are basing on