[Bug libstdc++/105880] eh_globals_init destructor not setting _M_init to false

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105880

--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For the record, r12-8589-gade3197134cc9e was needed to fix something in the
commits above, and was also backported to gcc-12.