Re-enable examples build on Windows with static hwloc

[lukaszstolarczuk]

Re-enable examples build on Windows with static hwloc - in other words revert this PR: #1056

This was failing intel/llvm builds - needs extra investigation, as the problem might be in UR improperly linking to hwloc, perhaps a wrong CMake path set somewhere, or an issue somewhere in intel/llvm (with Ninja builds).

[PatKamin]

It looks like the hwloc library is not automatically built before linking hwloc with umf binaries takes place. This is the case when using Ninja single config generator (-G Ninja configuration step argument).
The Visual Studio generator currently handles this correctly.

After fetching hwloc, I propose additional build steps, like ie.:

        if(CMAKE_GENERATOR STREQUAL "Ninja")
            add_custom_command(
                COMMAND ${CMAKE_COMMAND} -DCMAKE_INSTALL_PREFIX=${hwloc_targ_BINARY_DIR} -B build
                WORKING_DIRECTORY ${hwloc_targ_SOURCE_DIR}/contrib/windows-cmake/
                OUTPUT ${hwloc_targ_SOURCE_DIR}/contrib/windows-cmake/CMakeCache.txt)
            add_custom_command(
                COMMAND ${CMAKE_COMMAND} --build build
                WORKING_DIRECTORY ${hwloc_targ_SOURCE_DIR}/contrib/windows-cmake/
                OUTPUT ${hwloc_targ_SOURCE_DIR}/contrib/windows-cmake/build/lib/hwloc.lib
                DEPENDS ${hwloc_targ_SOURCE_DIR}/contrib/windows-cmake/CMakeCache.txt)
            add_custom_command(
                COMMAND ${CMAKE_COMMAND} --build build --target INSTALL
                WORKING_DIRECTORY ${hwloc_targ_SOURCE_DIR}/contrib/windows-cmake/
                OUTPUT ${hwloc_targ_BINARY_DIR}/lib/hwloc.lib
                DEPENDS ${hwloc_targ_SOURCE_DIR}/contrib/windows-cmake/build/lib/hwloc.lib)
            add_custom_target(hwloc_prod
                    DEPENDS ${hwloc_targ_BINARY_DIR}/lib/hwloc.lib)
            target_link_libraries(hwloc INTERFACE ${hwloc_targ_BINARY_DIR}/lib/hwloc.lib)
            add_dependencies(hwloc hwloc_prod)
        endif()