[directxtex] does not fully control its optional dependencies

[Neumann-A]

The port CMakeLists.txt has:

if(MINGW OR (NOT WIN32))
    find_package(directxmath CONFIG REQUIRED)
    find_package(directx-headers CONFIG REQUIRED)
else()
    find_package(directxmath CONFIG QUIET)
    find_package(directx-headers CONFIG QUIET)
endif()

if(directxmath_FOUND)
    message(STATUS "Using DirectXMath package")
    target_link_libraries(${PROJECT_NAME} PUBLIC Microsoft::DirectXMath)
endif()

if(directx-headers_FOUND)
    message(STATUS "Using DirectX-Headers package")
    target_link_libraries(${PROJECT_NAME} PUBLIC Microsoft::DirectX-Headers)
    target_compile_definitions(${PROJECT_NAME} PUBLIC USING_DIRECTX_HEADERS)
endif()

However the features of the port only control:

vcpkg_check_features(
    OUT_FEATURE_OPTIONS FEATURE_OPTIONS
    FEATURES
        dx11 BUILD_DX11
        dx12 BUILD_DX12 # This requires the headers package
        openexr ENABLE_OPENEXR_SUPPORT
        spectre ENABLE_SPECTRE_MITIGATION
        tools BUILD_TOOLS
)

So installing directx-headers before directxtex but without feature dx12 with poisson the binary cache for dependent ports.