Rename dbus-test to test-dbus to match common test application naming scheme.

[reverted the dbus-specification part -smcv]
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=73495
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Rename shell-test to test-shell to match common test application naming scheme.

[Add its source file to SOURCES: this test was previously relying on the
Automake feature that the default value of foo_bar_SOURCES is foo-bar.c. -smcv]

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=73495
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Rename spawn-test to test-spawn to match common test application naming scheme.

[Same change as for shell-test in the previous commit. -smcv]

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=73495
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Rename bus-test to test-bus to match common test application naming scheme.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=73495
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Rename bus-test-system to test-bus-system to match common test application naming scheme.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=73495
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Rename bus-test-launch-helper to test-bus-launch_helper to match common test application naming scheme.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=73495
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Let cmake 'make check' run test applications as test group.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=73495
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Revert "start spec 0.24"

It hasn't otherwise changed since 1.7.10.

This reverts commit fb16f80d457a66610f615b44158330bf7ba68697.
D-Bus 1.8.0
1.8.1
start towards 1.9
start spec 0.24
Give cmake users some hints/requirements when cross compiling for Windows on Linux.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=41252
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Merge branch 'dbus-1.8'