cargo2android.py: Support cargo_pkg_version flag.

This parses a module's Cargo.toml file for package version number,
setting it to cargo_pkg_version. Also sets cargo_env_compat true by
default.

Bug: 171011485
Test: generated Android.bp includes cargo_env_compat, cargo_pkg_version.
Change-Id: Ibb8021633719650e2021b90806374a5d3c6a161a
1 file changed