Fix typo in define guards

Needed to fix compilation with latest Mingw-w64 headers (version 3)

Change-Id: I70c7ff3d833e15e99a915a2df83f04d03a968300
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Require Windows Vista

The structure FDAP is only available as Windows Vista, and MinGW-w64
do not actually define it if _WIN32_WINNT isn't set.

Needed to fix compilation with latest MinGW-w64 headers (version 3).

Change-Id: I566ea6bd4c3d8d5a495b644aedffb7de42a6d6e4
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>