[Bug target/91148] PowerPC build gets several warnings due to -Wformat-diag

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91148

--- Comment #12 from David Edelsohn <dje at gcc dot gnu.org> ---
Dumping work onto all other target maintainers at a time not of their choosing
isn't acceptable either.