gnome-base/gnome-settings-daemon: bump to 3.24.2, backport memory reduction patches

gnome-base/gnome-settings-daemon: bump to 3.24.2, backport memory reduction patches

Also rebase the udevrulesdir patch, as it's gotten to fuzzy applying.
Unneeded gtk-init removal from plugins that didn't need it patch reduces their
private memory usage from ~5MB to 1-2MB (3 plugins, used by gdm and user).
CSS theme change patch should give a big win for those that still need gtk_init,
but I wasn't able to observe that personally.
Grab a color test fixing patch from gnome-3-24 in case it helps, but tests still
restricted due to power tests failing.

Package-Manager: Portage-2.3.5, Repoman-2.3.2