Use dbus provided version of va_copy().

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=72840
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
MSVC compile fix.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=73345
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Add glib support to cmake buildsystem.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=68506
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
test/dbus-daemon, test/dbus-daemon-eavesdrop: allow external dbus-daemon

It's easier to automate these tests if they launch their own
dbus-daemon, but easier to debug them if they don't: you can launch
a dbus-daemon separately, under gdb. However, tests that need a
specially-configured dbus-daemon will have to be skipped.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=68852
Reviewed-by: Ralf Habacker <ralf.habacker@freenet.de>
Remove obsolete cmake project tags in sub directories; we only have one project.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=68506
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>