Changes

Fix C++ name-mangling issue with `caml_state` on Cygwin (#14220)

Fix Cygwin problems linking with caml_state from C++

---------

Co-authored-by: Antonin Décimo <antonin@tarides.com>
Co-authored-by: David Allsopp <david.allsopp@metastack.com>
(cherry picked from commit 7e00974029993e160f053cf6df9bd6398836af32)