[Bug libstdc++/88999] [9 Regression] testcases using in_avail() fail on nios2-elf

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88999

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Target|                            |nios2-elf
   Target Milestone|---                         |9.0