[Bug libstdc++/65675] make bootstrap fails when configured with --disable-hosted-libstdcxx

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65675

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Since GCC itself now depends on a hosted C++ library, you can't disable the
hosted library when bootstrapping.