[Bug target/93157] gcc should use -mabi=elfv2 on powerpc64-*-linux-*musl* target by default.

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93157

--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Someone who can test this should send a patch, and Cc: the Musl OS port
maintainer
(is there one?  There should be!)