Draft: package/android: add an Android build script based on the libvlcjni one

Co-authored-by: Thomas Guillem thomas@gllm.fr Co-authored-by: Jean-Baptiste Kempf jb@videolan.org Co-authored-by: Alexandre Janniaux ajanni@videolabs.io Co-authored-by: Alexandre Perraud 4leyx4ndre@gmail.com Co-authored-by: Hugo Beauzée-Luyssen hugo@beauzee.fr Co-authored-by: Nicolas Pomepuy nicolas@videolabs.io Co-authored-by: Victorien Le Couviour--Tuffet victorien.lecouviour.tuffet@gmail.com Co-authored-by: Martin Finkel martin@videolabs.io Co-authored-by: Francois Cartegnie git@videolan.org Co-authored-by: Steve Lhomme robux4@ycbcr.xyz

Alternative to !6233 with all the cleanup applied to have "fresh" start.