win32: Added verify windows version functionality

                                 const PlatformIdentifier platform,

                                 const VersionCondition condition)

{

  (void) majorVersion;

  (void) minorVersion;

  (void) platform;

  (void) condition;

  bool matched = FALSE;

#if !defined(_WIN32_WINNT) || !defined(_WIN32_WINNT_WIN2K) || \

    (_WIN32_WINNT < _WIN32_WINNT_WIN2K)

  OSVERSIONINFO osver;

  memset(&osver, 0, sizeof(osver));

  osver.dwOSVersionInfoSize = sizeof(osver);

  /* Find out Windows version */

  if(GetVersionEx(&osver)) {

    /* Verify the Operating System version number */

    switch(condition) {

    case VERSION_LESS_THAN:

      if(osver.dwMajorVersion < majorVersion ||

        (osver.dwMajorVersion == majorVersion &&

         osver.dwMinorVersion < minorVersion))

        matched = TRUE;

      break;

    case VERSION_LESS_THAN_EQUAL:

      if(osver.dwMajorVersion <= majorVersion &&

         osver.dwMinorVersion <= minorVersion)

        matched = TRUE;

      break;

    case VERSION_EQUAL:

      if(osver.dwMajorVersion == majorVersion &&

         osver.dwMinorVersion == minorVersion)

        matched = TRUE;

      break;

    case VERSION_GREATER_THAN_EQUAL:

      if(osver.dwMajorVersion >= majorVersion &&

         osver.dwMinorVersion >= minorVersion)

        matched = TRUE;

      break;

    case VERSION_GREATER_THAN:

      if(osver.dwMajorVersion > majorVersion ||

        (osver.dwMajorVersion == majorVersion &&

         osver.dwMinorVersion > minorVersion))

        matched = TRUE;

      break;

    }

    /* Verify the platform identifier (if necessary) */

    if(matched && platform != PLATFORM_DONT_CARE) {

      switch(platform) {

      case PLATFORM_WINDOWS:

        if(osver.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS)

          matched = FALSE;

        break;

      case PLATFORM_WINNT:

        if(osver.dwPlatformId != VER_PLATFORM_WIN32_NT)

          matched = FALSE;

      }

    }

  }

#else

  ULONGLONG cm = 0;

  OSVERSIONINFOEX osver;

  BYTE majorCondition;

  BYTE minorCondition;

  BYTE spMajorCondition;

  BYTE spMinorCondition;

  switch(condition) {

  case VERSION_LESS_THAN:

    majorCondition = VER_LESS;

    minorCondition = VER_LESS;

    spMajorCondition = VER_LESS_EQUAL;

    spMinorCondition = VER_LESS_EQUAL;

    break;

  case VERSION_LESS_THAN_EQUAL:

    majorCondition = VER_LESS_EQUAL;

    minorCondition = VER_LESS_EQUAL;

    spMajorCondition = VER_LESS_EQUAL;

    spMinorCondition = VER_LESS_EQUAL;

    break;

  case VERSION_EQUAL:

    majorCondition = VER_EQUAL;

    minorCondition = VER_EQUAL;

    spMajorCondition = VER_GREATER_EQUAL;

    spMinorCondition = VER_GREATER_EQUAL;

    break;

  case VERSION_GREATER_THAN_EQUAL:

    majorCondition = VER_GREATER_EQUAL;

    minorCondition = VER_GREATER_EQUAL;

    spMajorCondition = VER_GREATER_EQUAL;

    spMinorCondition = VER_GREATER_EQUAL;

    break;

  case VERSION_GREATER_THAN:

    majorCondition = VER_GREATER;

    minorCondition = VER_GREATER;

    spMajorCondition = VER_GREATER_EQUAL;

    spMinorCondition = VER_GREATER_EQUAL;

    break;

  default:

    return FALSE;

  }

  memset(&osver, 0, sizeof(osver));

  osver.dwOSVersionInfoSize = sizeof(osver);

  osver.dwMajorVersion = majorVersion;

  osver.dwMinorVersion = minorVersion;

  if(platform == PLATFORM_WINDOWS)

    osver.dwPlatformId = VER_PLATFORM_WIN32_WINDOWS;

  else if(platform == PLATFORM_WINNT)

    osver.dwPlatformId = VER_PLATFORM_WIN32_NT;

  cm = VerSetConditionMask(cm, VER_MAJORVERSION, majorCondition);

  cm = VerSetConditionMask(cm, VER_MINORVERSION, minorCondition);

  cm = VerSetConditionMask(cm, VER_SERVICEPACKMAJOR, spMajorCondition);

  cm = VerSetConditionMask(cm, VER_SERVICEPACKMINOR, spMinorCondition);

  if(platform != PLATFORM_DONT_CARE)

    cm = VerSetConditionMask(cm, VER_PLATFORMID, VER_EQUAL);

  if(VerifyVersionInfo(&osver, (VER_MAJORVERSION | VER_MINORVERSION |

                                VER_SERVICEPACKMAJOR | VER_SERVICEPACKMINOR),

                       cm))

    matched = TRUE;

#endif

  return matched;

}

#if defined(USE_WINDOWS_SSPI) || (!defined(CURL_DISABLE_TELNET) && \

                                  defined(USE_WINSOCK))