[Bug target/78263] Compile failure with AltiVec library on PPC64le and -std=c++11 flag

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78263

--- Comment #9 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Right.  I am going to fix this early in stage 1 for GCC 10.  It slipped off my
radar again in 9, and I don't want to do it late in the release because of
potential fallout.