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

[meissner at gcc dot gnu.org]

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

--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
Or we can just decorate the sources with:

/* Disable warnings about misspelling built-in in GCC diagnostics.  */
#if __GNUC__ >= 10
#  pragma GCC diagnostic push
#  pragma GCC diagnostic ignored "-Wformat-diag"
#endif