persistent-cache-cpp: FTBFS against gcc-12

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cd /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /<<PKGBUILDDIR>> /<<PKGBUILDDIR>> /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/CMakeFiles/persistent-cache-cpp-doc.dir/DependInfo.cmake --color=
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warning: argument 'a4wide' for option PAPER_TYPE is not a valid enum value
Using the default: a4!
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cd /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /<<PKGBUILDDIR>> /<<PKGBUILDDIR>>/src/core /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/src/core /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/src/core/CMakeFiles/persistent-cache-cpp.dir/DependInfo.cmake --color=
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[  8%] Building CXX object src/core/CMakeFiles/persistent-cache-cpp.dir/internal/persistent_string_cache_impl.cpp.o
cd /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/src/core && /usr/bin/c++  -I/<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/src/core -I/<<PKGBUILDDIR>>/src/core -I/<<PKGBUILDDIR>>/include -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 --std=c++11 -Wall -pedantic -Wextra -Wcast-align -Wcast-qual -Wformat -Wredundant-decls -Wswitch-default -Wnon-virtual-dtor -Wctor-dtor-privacy -Wold-style-cast -MD -MT src/core/CMakeFiles/persistent-cache-cpp.dir/internal/persistent_string_cache_impl.cpp.o -MF CMakeFiles/persistent-cache-cpp.dir/internal/persistent_string_cache_impl.cpp.o.d -o CMakeFiles/persistent-cache-cpp.dir/internal/persistent_string_cache_impl.cpp.o -c /<<PKGBUILDDIR>>/src/core/internal/persistent_string_cache_impl.cpp
In file included from /<<PKGBUILDDIR>>/src/core/internal/persistent_string_cache_impl.cpp:19:
/<<PKGBUILDDIR>>/include/core/internal/persistent_string_cache_impl.h:184:9: error: field ‘handlers_’ has incomplete type ‘std::array<std::function<void(const std::__cxx11::basic_string<char>&, core::CacheEvent, const core::PersistentCacheStats&)>, 7>’
  184 |         handlers_;
      |         ^~~~~~~~~
In file included from /usr/include/c++/12/functional:54,
                 from /usr/include/boost/utility/compare_pointees.hpp:15,
                 from /usr/include/boost/optional/optional.hpp:55,
                 from /usr/include/boost/optional.hpp:15,
                 from /<<PKGBUILDDIR>>/include/core/optional.h:21,
                 from /<<PKGBUILDDIR>>/include/core/persistent_string_cache.h:23,
                 from /<<PKGBUILDDIR>>/include/core/internal/persistent_string_cache_impl.h:22:
/usr/include/c++/12/tuple:1595:45: note: declaration of ‘struct std::array<std::function<void(const std::__cxx11::basic_string<char>&, core::CacheEvent, const core::PersistentCacheStats&)>, 7>’
 1595 |   template<typename _Tp, size_t _Nm> struct array;
      |                                             ^~~~~
/<<PKGBUILDDIR>>/src/core/internal/persistent_string_cache_impl.cpp: In member function ‘int64_t core::internal::PersistentStringCacheImpl::disk_size_in_bytes() const’:
/<<PKGBUILDDIR>>/src/core/internal/persistent_string_cache_impl.cpp:589:24: error: variable ‘std::array<long unsigned int, 1> sizes’ has initializer but incomplete type
  589 |     array<uint64_t, 1> sizes = {{0}};
      |                        ^~~~~
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dh_auto_build: error: cd obj-x86_64-linux-gnu && make -j1 "INSTALL=install --strip-program=true" VERBOSE=1 returned exit code 2
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