Pip install hangs due to broken metadata dependency

[mdarnold1]

Install fails due to Xilinx/PYNQ-Metadata#20 (versions >0.1.2)
Temporary workaround is to follow Xilinx/PYNQ-Metadata#20 (comment)
and then install with --no-build-isolation.

Also affects https://pypi.org/project/pynq-compute-labs/ - reporting here because I can't find a git for that and I assume the projects are linked.

[mdarnold1]

Installer gets stuck with
"Installing build dependencies ... -"
Then with -v hangs here:
Collecting pynqmetadata>=0.0.1 (from pynq>=3.0.1)
Using cached pynqmetadata-0.1.5.tar.gz (237 kB)
Preparing metadata (setup.py): started

(Using recommended conda from https://pypi.org/project/pynq-compute-labs/, 0.1.5 is the latest that will install due to Python 3.9, but 0.1.7 installs ok from https://github.com/nocnokneo/PYNQ-Metadata)