FR-V PLT audit

[Roland McGrath]

> It's not like you'll have mips and i386 versions in the same binary
> in the first place, and therefore no need to make sure that the two
> are in separate namespaces.

That's not the concern.  The concern is that one could try to compile an
audit library on a different platform and have it seem like it's ok because
the signature happens to match, but in fact the audit library's
pltenter/pltexit functions have not been ported properly to the machine you
are compiling for.  Since those implementations are always
machine-specific, having the API distinguish the machine in the names makes
sure you have considered the target machine specifically.