[qt5] Warns of long path when path is as long as suggested.

[milnak]

Describe the bug

qt5 warns of long path when path is as long as suggested.

Environment

• OS: Windows 11

To Reproduce

1. ./vcpkg install qt5
2. See error

Installing 32/36 qt5-quickcontrols2:x64-windows@5.15.14...
Building qt5-quickcontrols2:x64-windows@5.15.14...
CMake Warning at scripts/cmake/vcpkg_buildpath_length_warning.cmake:4 (message):
  qt5-quickcontrols2's buildsystem uses very long paths and may fail on your
  system.

  We recommend moving vcpkg to a short path such as 'C:\src\vcpkg' or using
  the subst command.
Call Stack (most recent call first):
  installed/x64-windows/share/qt5/qt_download_submodule.cmake:13 (vcpkg_buildpath_length_warning)
  installed/x64-windows/share/qt5/qt_submodule_installation.cmake:5 (qt_download_submodule)
  ports/qt5-quickcontrols2/portfile.cmake:2 (qt_submodule_installation)
  scripts/ports.cmake:175 (include)

Expected behavior
Should be fine. I put vcpkg into D:\src\vcpkg which is exactly as long as the suggested c:\src\vcpkg

[JonLiu1993]

You can ignore this warning, it is caused by a limitation of Qt itself.

[github-actions]

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