[Bug bootstrap/77676] powerpc64 and powerpc64le stage2 bootstrap fail

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77676

--- Comment #17 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch to re-enable -fprintf-return-value:
  https://gcc.gnu.org/ml/gcc-patches/2016-11/msg00785.html