* sdkddkver.h: Whitespace tidy-up.  Add our standart license header.
(_WIN32_WINNT): Define default value as _WIN32_WINNT_WS03, i.e. 0x0502,
which is what we had been defining in windows.h until this day.
(NTDDI_VERSION): Define default value as NTDDI_WS03, i.e. 0x05020000,
matching what we had been defining in windows.h until this day.
(WINVER): Define default value as 0x0502, which is what we had been
defining in windows.h until this day.
* winnt.h: Include sdkddkver.h.
* windows.h: Include sdkddkver.h.
(WINVER): Now that we include sdkddkver.h, remove the extra definition.

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/stable/v2.x@4491 4407c894-4637-0410-b4f5-ada5f102cad1