[Bug bootstrap/101834] make distclean forgets ./c++tools/

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101834

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Patch submitted:
https://gcc.gnu.org/pipermail/gcc-patches/2023-March/614893.html