* gnu/packages/crates-io.scm (rust-ring-0.16)[source]: Add patch with
missing files. Adjust snippet to delete a pre-generated file.
[arguments]: Add a custom phase to rebuild the pre-generated-file.
[native-inputs]: Add clang, python-2.
* gnu/packages/patches/rust-ring-0.16-missing-files.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
