I need to update robin-map to 1.4.0, which was released in March for the CMake 4.0 issue.

In file included from /builddir/build/BUILD/libobjc2-2.2.1-build/libobjc2-2.2.1/arc.mm:10:
In file included from /usr/include/tsl/robin_map.h:34:
In file included from /usr/include/tsl/robin_hash.h:27:
In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15/algorithm:63:
In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15/bits/stl_algo.h:71:
/usr/bin/../lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15/cstdlib:83:15: fatal error: 'stdlib.h' file not found
   83 | #include_next <stdlib.h>
      |               ^~~~~~~~~~
1 error generated

Full logs:
https://download.copr.fedorainfracloud.org/results/hobbes1069/OIIO/fedora-rawhide-x86_64/09366280-libobjc2/builder-live.log.gz

Reproducible: Always