`USE_SYSTEM_GOOGLEBENCHMARK` does not build with benchmark-1.9.4

I'm trying to package cpuinfo for pkgsrc. We prefer to use already existing packages instead of including copies of the same sources, so I tried using the pkgsrc google-benchmark package, which is currently at version 1.9.4 (the latest as of today).

Using this, the build breaks with:

[61/66] Building CXX object CMakeFiles/init-bench.dir/bench/init.cc.o
FAILED: [code=1] CMakeFiles/init-bench.dir/bench/init.cc.o
/scratch/wip/cpuinfo/work/.cwrapper/bin/c++ -DCPUINFO_SUPPORTED_PLATFORM=1 -I/scratch/wip/cpuinfo/work/cpuinfo-33ed0be77d7767d0e2010e2c3cf972ef36c7c307/include -O2 -g -fstack-clash-protection -I/usr/pkg/include -MD -MT C
MakeFiles/init-bench.dir/bench/init.cc.o -MF CMakeFiles/init-bench.dir/bench/init.cc.o.d -o CMakeFiles/init-bench.dir/bench/init.cc.o -c /scratch/wip/cpuinfo/work/cpuinfo-33ed0be77d7767d0e2010e2c3cf972ef36c7c307/bench/in
it.cc
In file included from /scratch/wip/cpuinfo/work/cpuinfo-33ed0be77d7767d0e2010e2c3cf972ef36c7c307/bench/init.cc:1:
/scratch/wip/cpuinfo/work/.buildlink/include/benchmark/benchmark.h:1487:56: error: no matching function for call to 'make_unique<benchmark::internal::FunctionBenchmark>(const char [19], <unresolved overloaded function ty
pe>)'
 1486 |           ::benchmark::internal::make_unique<                         \
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1487 |               ::benchmark::internal::FunctionBenchmark>(#__VA_ARGS__, \
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
 1488 |                                                         __VA_ARGS__)))
      |                                                         ~~~~~~~~~~~~
/scratch/wip/cpuinfo/work/cpuinfo-33ed0be77d7767d0e2010e2c3cf972ef36c7c307/bench/init.cc:10:1: note: in expansion of macro 'BENCHMARK'
   10 | BENCHMARK(cpuinfo_initialize)->Iterations(1)->Unit(benchmark::kMillisecond);
      | ^~~~~~~~~
In file included from /usr/include/g++/memory:75,
                 from /scratch/wip/cpuinfo/work/.buildlink/include/benchmark/benchmark.h:178:
/usr/include/g++/bits/unique_ptr.h:1096:5: note: candidate: 'template<class _Tp, class ... _Args> std::__detail::__invalid_make_unique_t<_Tp> std::make_unique(_Args&& ...)' (deleted)
 1096 |     make_unique(_Args&&...) = delete;
      |     ^~~~~~~~~~~
/usr/include/g++/bits/unique_ptr.h:1096:5: note:   template argument deduction/substitution failed:
/usr/include/g++/bits/unique_ptr.h: In substitution of 'template<class _Tp> using __invalid_make_unique_t = typename std::__detail::_MakeUniq::__invalid_type [with _Tp = benchmark::internal::FunctionBenchmark]':
/usr/include/g++/bits/unique_ptr.h:1096:5:   required by substitution of 'template<class _Tp, class ... _Args> std::__detail::__invalid_make_unique_t<_Tp> std::make_unique(_Args&& ...) [with _Tp = benchmark::internal::Fu
nctionBenchmark; _Args = <missing>]'
/scratch/wip/cpuinfo/work/cpuinfo-33ed0be77d7767d0e2010e2c3cf972ef36c7c307/bench/init.cc:10:1:   required from here
/usr/include/g++/bits/unique_ptr.h:1057:11: error: no type named '__invalid_type' in 'struct std::__detail::_MakeUniq<benchmark::internal::FunctionBenchmark>'
 1057 |     using __invalid_make_unique_t = typename _MakeUniq<_Tp>::__invalid_type;
      |           ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/g++/bits/unique_ptr.h:1086:5: note: candidate: 'template<class _Tp> std::__detail::__unique_ptr_array_t<_Tp> std::make_unique(size_t)'
 1086 |     make_unique(size_t __num)
      |     ^~~~~~~~~~~
/usr/include/g++/bits/unique_ptr.h:1086:5: note:   candidate expects 1 argument, 2 provided
/usr/include/g++/bits/unique_ptr.h:1071:5: note: candidate: 'std::__detail::__unique_ptr_t<_Tp> std::make_unique(_Args&& ...) [with _Tp = benchmark::internal::FunctionBenchmark; _Args = {}; __detail::__unique_ptr_t<_Tp>
= __detail::__unique_ptr_t<benchmark::internal::FunctionBenchmark>]'
 1071 |     make_unique(_Args&&... __args)
      |     ^~~~~~~~~~~
/usr/include/g++/bits/unique_ptr.h:1071:5: note:   candidate expects 0 arguments, 2 provided
[63/66] Building CXX object CMakeFiles/init-test.dir/test/init.cc.o

When I provide the version 1.6.1 that DownloadGoogleBenchmark.cmake tries to fetch, the build succeeds.

Start with DownloadGoogleBenchmark.cmake and bench/init.cc, then compare the system benchmark 1.9.4 interface with the bundled 1.6.1 version that succeeds. Verify the compatibility change by rebuilding with USE_SYSTEM_GOOGLEBENCHMARK enabled and running the init test in test/init.cc.