[Bug libstdc++/104866] New: this_thread_sleep.h doesn't compile if _GLIBCXX_NO_SLEEP is defined

[dv at vollmann dot ch via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104866

            Bug ID: 104866
           Summary: this_thread_sleep.h doesn't compile if
                    _GLIBCXX_NO_SLEEP is defined
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dv at vollmann dot ch
                CC: dv at vollmann dot ch
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: avr
             Build: x86_64-linux-gnu

Created attachment 52596
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52596&action=edit
Patch to fix the problem

this_thread_sleep.h opens the namespace std::this_thread before checking for
the define but then closes it inside the #ifndef