[Bug libstdc++/124268] `import std` initializer symbol is not shipped in `libstdc++`

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124268

--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I've reverted the patch due to Bug 124268. I'll try again after 16.1 is
released.