Remove the unused limit_section argument in testenv.osmo_dev.make(). The idea was to use osmo-dev to build programs where no packages are available when using --binary-packages, but this didn't work because when using --binary-packages, we must install all package dependencies from the binary repository (so testing nightly / latest use the expected library versions). Nowadays this use case is handled by podman_install.from_source_* functions without using osmo-dev.
Pass the targets we are about to build to osmo-dev's gen_makefile script. This has two advantages:
1) Check early if a target isn't known by the current osmo-dev version, displaying a useful error to the user instead of just failing during make later on:
ERROR: filter_projects_deps_targets: can't find project osmo-new-project in projects_deps!
[testenv] gen_makefile.py from osmo-dev failed! [testenv] Your osmo-dev.git clone might be outdated, try: [testenv] $ git -C /home/user/code/osmo-dev pull
2) Parsing the generated Makefile when running "make" after generating it doesn't cause a noticable delay anymore. On my machine (with many Osmocom git repos cloned in osmo-dev's src dir) it went from several seconds to instantly.
