[Bug lto/94259] --without-zstd seems to have no effect and links libzstd if available

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94259

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 48093
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48093&action=edit
Patch candidate

There's a patch candidate. Can you please test it?