fd8527a20e guix: remove errant leftover from #29648 (fanquake)
Pull request description:
We no longer build a lib, so a non-existent dir is causing builds to fail.
ACKs for top commit:
josibake:
ACK fd8527a20e
hebasto:
ACK fd8527a20e.
TheCharlatan:
ACK fd8527a20e
Tree-SHA512: 9175a0de3f95f56939b3eaa3e89dca2cfae4996bcd84ef6b8e2872672bef39cb0550c9f4a79475d887eb8fac92c15dfa8c352648ff167d54a0b736978412226c