winetest: Add SystemPreferredUILanguages to the log.

[Akihiro Sagawa]

A few GDI functions are affected by System accout's display language (by
GetSystemPreferredUILanguages).

For a localized version of windows, it's usually the same language as
localized one. But, some of testbots are implemented in MUI settings and
they still uses English locale for it [1].

I think this is not a bug, but a proper setting. However, it's hard to
distinguish. Thus, I add a log line for the information.

[1] https://testbot.winehq.org/JobDetails.pl?Key=14650&log_206=1#k206
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 programs/winetest/main.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

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