[bug #66915] Avoid rebuilding existing order-only prerequisites.

Follow-up Comment #1, bug #66915 (group make):

Suggested by Britton Kerin here
https://lists.gnu.org/archive/html/bug-make/2025-03/msg00006.html.
This is an excerpt from that email.
"What confuses me is that since the explicitly requested foo exists and isn't
out of date with respect to any non-order-only prereqs (in the example it
doesn't have any) and therefore isn't getting rebuilt, I wouldn't expect there
to be any need to rebuild it's order-only prereqs either.  I would think
"order-only" would only impose an order constraint on the execution of the
recipes, and since foo's recipe isn't happening why should bar's need to?
There's no order violation if it doesn't, and in fact it's a bit of a misuse
of the term "order" to describe the current behavior since (in the example)
only one recipe is executing.  Make is building slightly too much here which
is contrary to its purpose."


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