Merging the dbus4win code upstream

[Tor Lillqvist]

> The patch should be splitted into smaller pieces like autotool build system,
> cmake build system, windows only code fixes, main codes fixes.

D'oh, it is in small pieces. 114 of them: for each individual git
commits. The file in question is just the output of git --format-patch
--stdout.

The "diffstat" part of each commit's comment tells pretty clearly what
part of the source code it affects, if the textual comment doesn't say
it clearly enough.

--tml