[poppler] Disable clang-format check

[NancyLi1013]

Describe the pull request

• What does your PR fix? Fixes #

clang-format.exe cannot be found now, So disable clang-format.

'clang-format' is not recognized as an internal or external command,
operable program or batch file.
'true' is not recognized as an internal or external command,
operable program or batch file.

[NancyLi1013]

The regressions caused by gettext will be fixed by PR #15740

[NancyLi1013]

cc @BillyONeal

[NancyLi1013]

Currently, I have added clang-format. Seems it needs to be installed on our CI machine.

CMake Error at scripts/cmake/vcpkg_find_acquire_program.cmake:566 (message):
  Could not find clang-format.  Please install it via your package manager:

      sudo apt-get install clang-format

[BillyONeal]

Rather than trying to provide clang-format I think we should be patching out whatever uses it in poppler's build system.

[NancyLi1013]

Thanks for your suggestion @BillyONeal. I will revert this changes about clang-format.