RFA: Fix microblaze ada --enable-werror-always build

[Joern Rennecke]

Quoting "Joseph S. Myers" <joseph@codesourcery.com>:

> There are two uses of this macro and you changed both of them - that is,
> technically, after this patch people can start converting targets to
> define the hook.  Would it really have been any harder to make it a
> documented hook (with documentation of the hook in tm.texi.in duplicating
> that of the macro)?

It would be easy if we could get the FSF's permission to re-license
stuff from tm.texi under the GPL.

At the moment, we either have to leave stuff undocumented in target.def,
and create more non-transferrable documentation in tm.texi.in, or
throw away our existing documentation to start from scratch with GPL/GFDL
dual-licensed documentation for the hook.

Do we have any progress on the licensing issue?