[Bug libstdc++/99327] ENOTSUP macro does not exist on djgpp crt

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99327

--- Comment #1 from cqwrteur <unlvsur at live dot com> ---
Created attachment 50277
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50277&action=edit
DJGPP's original errno

This is djgpp crt's original errno.