message: Use WINHTTP_ACCESS_TYPE_AUTOMATIC_PROXY instead of WINHTTP_ACCESS_TYPE_DEFAULT_PROXY when Windows 8.1 and newer
diff: #include <vcpkg/base/util.h>
  #include <vcpkg/commands.h>
  +#include <VersionHelpers.h>
  +
  namespace vcpkg::Downloads
  {
  #if defined(_WIN32)
  @@ -29,7 +31,9 @@ namespace vcpkg::Downloads
  std::to_string(err));
  auto hSession = WinHttpOpen(
  - L"vcpkg/1.0", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
  + L"vcpkg/1.0",
  + IsWindows8Point1OrGreater() ? WINHTTP_ACCESS_TYPE_AUTOMATIC_PROXY : WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
  + WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
  Checks::check_exit(VCPKG_LINE_INFO, hSession, "WinHttpOpen() failed: %d", GetLastError());
  // Use Windows 10 defaults on Windows 7
  