Enclose the API definitions in an extern "C" section.
Define function pointer types if INCL_WINSOCK_API_TYPEDEFS is defined.
Better stick to the types defined by the PSDK.
Update win32.api.
Make them compatible with both the Unix C headers and the MSVCRT
headers.
Ensure compatibility with the Unix headers via the USE_WS_PREFIX
macro.
Add WINE_NOWINSOCK: prevents winsock.h from being included from
windows.h when defined.
Add ws2tcpip.h, move definitions to the right header.