video/windows: ANSI/UNICODE updates (cf. bug 5435):

- explicitly use UNICODE versions of DrawText, EnumDisplaySettings,
  EnumDisplayDevices, and CreateDC: the underlying structures have
  WCHAR strings.
- change WIN_UpdateDisplayMode and WIN_GetDisplayMode() to accept
  LPCWSTR instead of LPCTSTR for the same reason.
- change WIN_StringToUTF8 and WIN_UTF8ToString to the explicit 'W'
  versions where appropriate.
5 files changed