Alright, was not expecting to mess up this patchset so bad so here we go:

This patchset reintroduces proper targetrustm hooks without the old
problematic mess of macros we had, which had been removed for the first
merge of gccrs upstream.

Tested on x86-64 GNU Linux, and has also been present in our development
repository for a long time - added by this pull-request from Iain [1]
which was merged in October 2022.

Ok for trunk?

[PATCH 01/14] rust: Add skeleton support and documentation for
[PATCH 02/14] rust: Reintroduce TARGET_RUST_CPU_INFO hook
[PATCH 03/14] rust: Reintroduce TARGET_RUST_OS_INFO hook
[PATCH 04/14] rust: Implement TARGET_RUST_CPU_INFO for i[34567]86-*-*
[PATCH 05/14] rust: Implement TARGET_RUST_OS_INFO for *-*-darwin*
[PATCH 06/14] rust: Implement TARGET_RUST_OS_INFO for *-*-freebsd*
[PATCH 07/14] rust: Implement TARGET_RUST_OS_INFO for *-*-netbsd*
[PATCH 08/14] rust: Implement TARGET_RUST_OS_INFO for *-*-openbsd*
[PATCH 09/14] rust: Implement TARGET_RUST_OS_INFO for *-*-solaris2*.
[PATCH 10/14] rust: Implement TARGET_RUST_OS_INFO for *-*-dragonfly*
[PATCH 11/14] rust: Implement TARGET_RUST_OS_INFO for *-*-vxworks*
[PATCH 12/14] rust: Implement TARGET_RUST_OS_INFO for *-*-fuchsia*.
[PATCH 13/14] rust: Implement TARGET_RUST_OS_INFO for
[PATCH 14/14] rust: Implement TARGET_RUST_OS_INFO for *-*-*linux*.

[1]: https://github.com/Rust-GCC/gccrs/pull/1543