Add a custom script to build the final library.

I could not find how to tell CMake that some libraries must be linked with the
arguments --no-as-needed and --whole-archive and some with --as-needed and
--no-whole-archive. So I have replaced the CMake work by a custom command in a
shell script.

The game starts well on the phone for the first time :)
The android application runs in landscape, with no title bars.
Sets the properties on the right nodes in AndroidManifest.xml

The <application> has the theme.
Set the min sdk version in AndroidManifest.

Thus the game plays at the best resolution.