[Bug c++/69317] [6 regression] wrong ABI version in -Wabi warnings

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69317

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Slightly tweaked patch posted for review:
https://gcc.gnu.org/ml/gcc-patches/2016-01/msg01206.html