Outdated hack in drone-build-raspbian.sh

[leamas]

drone-build-raspbian.sh contains a hack which download a pre-built 3.19 cmake package. This hack was to provide a cmake version >= 3.19 which wasn't available from pypi at that time.

However, pypi now has cmake 3.20 available, so the hack could and should be replaced by using the regular pypi cmake package, just as other platforms does.

There is no hurry here. Right now we might need to stabilize the code, so these kind of changes could be postponed.

[leamas]

hm... This isn't that easy. Filed scikit-build/cmake-python-distributions#192, problems using the cmake pypi wheel on armhf/buster.

We will have to stay with the hack for now, perhaps even create a new build for bullseye. Sigh.

[leamas]

There is input in upstream bug. Need to see if it can be used to walk around this.

[leamas]

There are new 3.20 packages available for armhf at https://cloudsmith.io/~alec-leamas/repos/opencpn-plugins-stable/packagehttps://cloudsmith.io/~alec-leamas/repos/opencpn-plugins-stable/packages/s/. This should by us some time over the 5.6.0 cycle, but does not represent a viable, long-term solution.

EDIT: Packages are available for Buster and Bullseye, not Stretch (which will be removed). Upstream packaging repo (finally!) at https://gitlab.com/leamas/cmake

[leamas]

The drone builder is dropped, making this issue void. Closing