[gentoo-catalyst] catalyst's ccache USE flag seems a bit stupid

[Matt Turner <mattst88@gentoo.org>]

In the catalyst ebuild we have

    # Here is where we actually enable ccache
    use ccache && \
        dosed 's:options="autoresume kern:options="autoresume ccache kern:' \
        /etc/catalyst/catalyst.conf
    dosed "s:/usr/lib/catalyst:/usr/$(get_libdir)/catalyst:" \
        /etc/catalyst/catalyst.conf

The ccache USE flag simply adds ccache to RDEPEND and trivially
modifies a .conf file.

Can we assume that people using catalyst are smart enough to realize
that if they turn on ccache in the .conf file that they need to
install ccache?

Matt