Attempt to fix Android build on Github Actions #24
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Github has apparently changed the build environment in Actions, breaking our Android builds. Quite subtle: both the last working build and the first broken build use "Ubuntu 20.04" but the Android tools have been updated in the latest virtual environment version https://github.com/actions/virtual-environments/blob/ubuntu20/20210111.1/images/linux/Ubuntu2004-README.md#android
EDIT: Unfortunately, the old environment does not seem to be available anymore as also Ubuntu 18 was updated to use the new NDK/tools (as described here actions/runner-images#2420). This will cause some headache with the plain Make deps (CMake deps are presumably fine). Some more info
At this point, just installing the old and working build environment into a Docker image seems like a more attractive option than reading those ^