Fix cargo2rulesmk.py dependency bug in sandbox

Remove the check performed by cargo2rulesmk.py
whether the external/rust/crates/{name} directories
exist for all dependencies of the current crate.
These directories only exist in the Android tree,
not in the minimal checkout inside the redshell sandbox.

Bug: 281857510
Test: cargo2rulesmk.py on thiserror-impl
Change-Id: I1e5d46b4de3129770ab87ebc5e58563010ae6605
1 file changed