[Bug lto/84995] Document gcc-ar and gcc-ranlib vs {libdir}/bfd-plugins (or actually start to install liblto_plugin under $LIBDIR/bfd-plugins)

[eschwartz93 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84995

--- Comment #21 from Eli Schwartz <eschwartz93 at gmail dot com> ---
I think that it makes sense to install this, for the same reason that one would
wish to install the "gcc" symlink. If the user only has a single supported GCC
version, this is a benefit. If the user has multiple versions, the user already
has to wrangle and retarget symlinks to the preferred provider (possibly via a
script such as Gentoo's "eselect gcc").