As all these crates are only used by c2rust itself, they can be safely
removed.

* gnu/packages/patches/c2rust-ast-exporter-local-search.patch: Delete file.
* gnu/packages/c2rust.scm: Delete file.
(rust-c2rust-ast-builder-0.18, rust-c2rust-ast-exporter-0.18)
(rust-c2rust-ast-printer-0.18, rust-c2rust-bitfields-0.18)
(rust-c2rust-bitfields-derive-0.18, rust-c2rust-build-paths-0.18)
(rust-c2rust-transpile-0.18): Delete variables.
(%tinycbor-source, c2rust): Move to ...
* gnu/packages/rust-apps.scm (%tinycbor-source, c2rust): ...here.
* gnu/local.mk (GNU_SYSTEM_MODULES): Unregisiter c2rust module.
(dist_patch_DATA): Unregisiter patch.
* etc/teams.scm (rust): Remove the file from scope.
* CODEOWNERS: Likewise.

Change-Id: I06dd323c5d209b92f7cc13f7fbcbe79fe868a8ff

* gnu/packages/c2rust.scm (c2rust)[native-inputs]: Remove labels.

Change-Id: I29083c8b9057c51ff10c634bd3147d069eb81dfe

* gnu/packages/c2rust.scm (%tinycbor-source)[file-name]: Add file name.
* gnu/packages/c2rust.scm (c2rust)[source]: Remove snippet.
[inputs]: Use ‘cargo-inputs’.
[arguments]: Remove #:cargo-inputs.
<#:phases>: In ‘patch’, access %tinycbor-source by origin name and patch
CMakeLists.txt of rust-c2rust-ast-exporter.
* gnu/packages/rust-crates.scm (lookup-cargo-inputs)[c2rust]: New entry.

Change-Id: Ifc17c1de2b514cb9f5d9b0d63a12f0d2d5a890c4

* gnu/packages/c2rust.scm (rust-c2rust-ast-builder-0.18)[arguments]:
Don't skip the build.

Change-Id: I0061f52367bead6dd410d251ba773b1112dba05a

* gnu/packages/c2rust.scm (rust-c2rust-ast-exporter-0.18)[arguments]:
Remove skip-build field.
[native-inputs]: Replace cmake with cmake-minimal.

Change-Id: I5432ce864e336c89619cb8a9bfb1ff727df6f26e

* gnu/packages/c2rust.scm (rust-c2rust-ast-printer-0.18)[arguments]:
Don't skip the build.

Change-Id: Ie94fac99924bb44dfd5bf4f5c1300b9530246c3c

* gnu/packages/c2rust.scm (rust-c2rust-bitfields-0.18)[arguments]: Don't
skip the build.
[cargo-development-inputs]: Add rust-libc-0.2.

Change-Id: I65045e648d4a11c6a860872a652f075fda9e5479

* gnu/packages/c2rust.scm (rust-c2rust-bitfields-derive-0.18)[arguments]:
Don't skip the build.

Change-Id: Icf0ac840c34cbd8331561aad00f23a1400c3ec13

* gnu/packages/c2rust.scm (rust-c2rust-build-paths-0.18)[arguments]:
Don't skip the build.

Change-Id: Ic8260e297d02068e7ce10068479478b6b657fda8

* gnu/packages/c2rust.scm (rust-c2rust-transpile-0.18)[arguments]: Don't
skip the build.  Add a phase to prepare the tinycbor source.
[native-inputs]: Add clang, cmake-minimal, %tinycbor-source.
[inputs]: Add llvm.

Change-Id: I97eee53fe2d0b1f6855e256b4a6768634b56f781