Fix path to add3prf.py when calling from get_rust_pkg.py

When --add3prf is set, `get_rust_pkg.py` script `cd` into the crate directory and run `add3prf.py`. However, `add3prf.py` doesn't exist in the newly downloaded crate directory. This CL ensures that we reference to the existing `add3prf.py` script.

Test: development/scripts/get_rust_pkg.py -add3prf -v -o /tmp tinyjson-2.5.1
Change-Id: I4273d4f2b6a1f353960adbbab9abbb96bf3e68f3
1 file changed