As a transition aide, implement an alternative elfN_freebsd_fixup which
is called for older powerpc binaries. This uses the old values and should allowSimilarly, add a translation to rtld to
anconvert old userspace to work withvalues to new ones (as expected by a new kernelrtld).
TODOs:Translation of old<->new values is incomplete, but sufficient to allow an
- Find out how a new rtld works with old binaries. We may need a
seperate sysent for old binaries that calls an old rtld.
- Put this code under ifdefs and remove the non-powerpc cases.
NOTE: this has been lightly tested on mips64, but not on powerpc so I've
only verified that binaries run the right fixup functioninstallworld of a new userspace from an old one when a new kernel is running.