The android build process doesn't waste time running optipng and such, since
it takes minutes to run properly.
I had already ran this a few months ago. Running it again gives an apk ~15KB
smaller, which is welcome. This is because of the new images added.
It is not helpful to the user to tell them they can download from the web
when they are using swap, since a) they should use F-Droid since its safer,
and b) they are probably using swap because they can't access the web
reliably.
