onetbb needs a fallback for posix_memalign on 10.4–10.5

[barracuda156]

Someone helped me to test the build on 10.5.8, and it fails:

:info:build [  4%] Building CXX object src/tbb/CMakeFiles/tbb.dir/allocator.cpp.o
:info:build cd /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_onetbb/onetbb/work/build/src/tbb && /opt/local/bin/g++-mp-14 -D__TBB_BUILD -D__TBB_USE_ITT_NOTIFY -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_onetbb/onetbb/work/oneTBB-2021.13.0/src/tbb/../../include -pipe -Os -Wno-parentheses -Wno-unused-function -DNDEBUG -I/opt/local/include -D_GLIBCXX_USE_CXX11_ABI=0 -std=c++11 -arch ppc -mmacosx-version-min=10.5 -fPIC -flifetime-dse=1 -Wall -Wextra -Werror -Wfatal-errors -D_XOPEN_SOURCE -fstack-clash-protection -fno-strict-overflow -fno-delete-null-pointer-checks -fwrapv -Wformat -Wformat-security -Werror=format-security -fstack-protector-strong -D_FORTIFY_SOURCE=2 -MD -MT src/tbb/CMakeFiles/tbb.dir/allocator.cpp.o -MF CMakeFiles/tbb.dir/allocator.cpp.o.d -o CMakeFiles/tbb.dir/allocator.cpp.o -c /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_onetbb/onetbb/work/oneTBB-2021.13.0/src/tbb/allocator.cpp
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_onetbb/onetbb/work/oneTBB-2021.13.0/src/tbb/allocator.cpp: In function 'void* tbb::detail::r1::std_cache_aligned_allocate(std::size_t, std::size_t)':
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_onetbb/onetbb/work/oneTBB-2021.13.0/src/tbb/allocator.cpp:210:15: error: 'posix_memalign' was not declared in this scope
:info:build   210 |     int res = posix_memalign(&p, alignment, bytes);
:info:build       |               ^~~~~~~~~~~~~~
:info:build compilation terminated due to -Wfatal-errors.
:info:build make[2]: *** [src/tbb/CMakeFiles/tbb.dir/allocator.cpp.o] Error 1

This is a known issue: macOS < 10.6 has no posix_memalign and should fall back to malloc instead.

[kencu (Ken)]

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