Revert "c2a: add option to use Cargo.toml.orig"

This reverts commit 2adbd7ed89d6f4cd7a4766a2a534697f498171a0.

Reason for revert: This doesn't work in all cases. For now I'll
instead use local patches for Cargo.toml :(

Change-Id: I0621796e694e2654a01fe9a38a307fd0a4ab8b15
1 file changed