[Rpm-maint] [rpm-software-management/rpm] Shorten the path of the RPM-controlled per-build directory (Discussion #3438)

[lantw44]

Each Guix package directory includes a hash, so it is typical for a directory to take 50 bytes. For example, you can find `/gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8` in its official binary tarball. The problem is that Guix uses this kind of long path in shebangs and Unix socket paths, so it can hit the limit if the test directory is too long.

It looks like moving the test directory to /tmp (using `mktemp -d`) with an autoconf cache variable is the only solution.

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