Also edit MULTILIB_OSDIRNAMES in target fragment.

The GCC Internals manual (gcc/doc/fragments.texi) says:

> For configurations that support both multilib and multiarch,
> MULTILIB_OSDIRNAMES also encodes the multiarch name, thus subsuming
> MULTIARCH_DIRNAME.
>
[...]
>
> MULTIARCH_DIRNAME is not used for configurations that support both multilib
> and multiarch.  In that case, multiarch names are encoded in
> MULTILIB_OSDIRNAMES instead.

This sounds like the makefile macro used depends on the build-time user
configuration; that is, the options --disable-multilib and --enable-multiarch
should cause MULTIARCH_DIRNAME to be used.

Instead, it seems MULTILIB_OSDIRNAMES is used, even if multilib is disabled.  So
apparently, "configurations that support both" means GCC target configurations
that support both features, not build-time user configurations that enable them.

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