[Rpm-maint] [rpm-software-management/rpm] The behavior of `%{?builtin_macro:foo}` is unclear from documentation (Issue #1866)

[Panu Matilainen]

> From the beginning, this was not about "file existence" but about the load builtin existence. The problem is that load is not available in RHEL 7 while it is available in RHEL8+.

Well, good to have that cleared because it wasn't clear to me *at all* what this is about. 
So what you're asking for is backwards compatible way of figuring out whether X is supported or not. There isn't, see #717.

Okay, argument checking differs with builtins in the `%{?foo}` test, maybe there's something that can be done about that. You can work around that with using `%{defined foo}` instead, which in case of a builtin "foo" will give you a hint whether you're on >= 4.17 or older but not whether you're on 4.11 or 4.14.

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