[Bug libgomp/95203] OpenACC 2.6 deep copy: attach/detach API routines: no-op behavior

[tschwinge at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95203

--- Comment #3 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
Created attachment 48563
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48563&action=edit
'mdc-detach-nop-2-r.c'

I have similar test cases for OpenACC directives (which are to exhibit similar
behavior), but for avoidance of doubt, let's first address this for the OpenACC
runtime library routines.