Use cmake build in executable suffix.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=41252
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Define TEST_BUS_LAUNCH_BINARY for cmake to keep in sync with autotools.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=41252
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Create session.conf and system.conf for test/data/valid-config-files from *.in files on cmake.

We need to patch the listen address.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=41252
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Fix mentioned files in Building section.
Add 'check' cmake target to keep in sync with autotools.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=41252
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Use macros for test and helper executable targets on cmake build system.

The new macros add_test_executables and add helper_executables provides a
platform independent way for specifing dbus test and service applications.

On native Windows and Linux/UNIX systems the test applications are
directly runable.

When cross compiling for Windows on Linux test applications could be
executed on the Linux host system with the help of wine and activated
binfmt_misc support for wine.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=41252
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
tests: don't block and wait for a debugger on abort

In general, I think developers running the tests would expect
them to terminate rather than hanging. Developers who want to debug
such an abort by attaching a debugger to a live process can still set
DBUS_BLOCK_ON_ABORT in the environment.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=41252
Reviewed-by: Ralf Habacker <ralf.habacker@freenet.de>