examples: Port Android examples to CMake
Hi all,
This PR migrates the remaining Android examples to CMake. Unfortunately I found some bugs in the CMake module, which are addressed in cerbero!1631 (merged); this MR requires the other to work.
Additionally, the 1.26 SDK no longer ships libsoup 2.4, so I had to port the webrtc example to libsoup 3.0. This wasn't ported earlier because this example is not built in CI, as far as I could check.
Let me know what you think.