Please split "libijs" into its own package.

Rationale:

Long I had the impression I needed ghostscript to be able to print (to my
non-PostScript) printer. But checking dependencies, I see that cups-filters
only needs libijs-0.35.so from the ghostscript package.

If my analysis is correct, libijs does not have any dependencies besides glibc.
I found no reference to calling a ghostscript binary either.

In other words, I could remove the dinosaur ghostscript package, if that
library was in a separate package.

Recent discussions about security of ghostscript suggests that it isn't a
wanted package either.