There's 8 megs of docs in usr/share/ghostscript/8.61/doc,
including Details8.htm, which is a 2.5 meg HTML file,
the fascinating Detailed History Of Ghostscript Verions.
It's just possible that the system could run without that.

I don't think you're allowed to build it without including that stuff,
but there shouldn't be any harm in users deleting it after installation.