build/make/Makefile.in: For script packages without spkg-install, run "sage -info" and exit with error #31163
Description
Then scripts like build/pkgs/perl_cpan_polymake_prereq/spkg-install can be removed.
This will help toward #31522 - because the GH Actions scripts can just avoid trying to install these packages.
CC: @kliem @jhpalmieri @slel
Component: build
Author: Matthias Koeppe
Branch/Commit: c1bf356
Reviewer: John Palmieri
Issue created by migration from https://trac.sagemath.org/ticket/31163