Update Guile to version 2.2.5, modern stable version, and fix dependent
ports to build against it. Most changes are rather minor and mechanical
except for the devel/gdb (obtained via their bugtracker [1], courtesy of
Doug Evans). One port (science/meep) I had to mark BROKEN after fixing
it proved to be very tedious and actually unreliable. It is very old,
there are newer versions available so it should be fixed by updating.
One port (devel/libruin) had revealed a bug in the new Guile code (an
auxiliary script, really) that had to be worked-round; reference to the
problematic upstream commit is provided in the patch.
PR: 229613
Exp-run by: antoine
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=21104#c8