[Rpm-maint] [rpm-software-management/rpm] Introduce an rpm-controlled per-build directory (PR #2885)

[lantw44]

Is it possible to shorten the `<package>-<version>-build` part from a spec file?

I package Guix in Fedora Copr. To run Guix tests in the rpmbuild %check step, the full path of the working directory cannot be longer than 29 bytes. The default `/builddir/build/BUILD/guix-1.4.0` used by mock is already too long, so I have to change the default `test-tmp` directory used by Guix tests to `t` to save a few bytes in order to run tests.

Now the new default `/builddir/build/BUILD/guix-1.4.0-build/guix-1.4.0` is even longer than `/builddir/build/BUILD/guix-1.4.0`, so the `test-tmp` → `t` trick can't work. Is it possible to tell rpmbuild to use a shorter path than `guix-1.4.0-build`, or I should just `mktemp -d` and tell Guix to run tests in the temporary directory?

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