rust: proc-macro2: add `README.md`

Originally, when the Rust upstream `alloc` standard library crate was
vendored in commit 057b8d257107 ("rust: adapt `alloc` crate to the
kernel"), a `README.md` fi

rust: proc-macro2: add `README.md`

Originally, when the Rust upstream `alloc` standard library crate was
vendored in commit 057b8d257107 ("rust: adapt `alloc` crate to the
kernel"), a `README.md` file was added to explain the provenance and
licensing of the source files.

Thus do the same for the `proc-macro2` crate.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Tested-by: Gary Guo <gary@garyguo.net>
Tested-by: Jesung Yang <y.j3ms.n@gmail.com>
Link: https://patch.msgid.link/20251124151837.2184382-10-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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rust: proc-macro2: remove `unicode_ident` dependency

The `proc-macro2` crate depends on the `unicode-ident` crate to determine
whether characters have the XID_Start or XID_Continue properties accord

rust: proc-macro2: remove `unicode_ident` dependency

The `proc-macro2` crate depends on the `unicode-ident` crate to determine
whether characters have the XID_Start or XID_Continue properties according
to Unicode Standard Annex #31.

However, we only need ASCII identifiers in the kernel, thus we can
simplify the check and remove completely that dependency.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Tested-by: Gary Guo <gary@garyguo.net>
Tested-by: Jesung Yang <y.j3ms.n@gmail.com>
Link: https://patch.msgid.link/20251124151837.2184382-9-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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rust: proc-macro2: add SPDX License Identifiers

Originally, when the Rust upstream `alloc` standard library crate was
vendored in commit 057b8d257107 ("rust: adapt `alloc` crate to the
kernel"), the

rust: proc-macro2: add SPDX License Identifiers

Originally, when the Rust upstream `alloc` standard library crate was
vendored in commit 057b8d257107 ("rust: adapt `alloc` crate to the
kernel"), the SPDX License Identifiers were added to every file so that
the license on those was clear.

Thus do the same for the `proc-macro2` crate.

This makes `scripts/spdxcheck.py` pass.

Reviewed-by: Gary Guo <gary@garyguo.net>
Tested-by: Gary Guo <gary@garyguo.net>
Tested-by: Jesung Yang <y.j3ms.n@gmail.com>
Link: https://patch.msgid.link/20251124151837.2184382-8-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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rust: proc-macro2: import crate

This is a subset of the Rust `proc-macro2` crate, version 1.0.101
(released 2025-08-16), licensed under "Apache-2.0 OR MIT", from:

https://github.com/dtolnay/pro

rust: proc-macro2: import crate

This is a subset of the Rust `proc-macro2` crate, version 1.0.101
(released 2025-08-16), licensed under "Apache-2.0 OR MIT", from:

https://github.com/dtolnay/proc-macro2/raw/1.0.101/src

The files are copied as-is, with no modifications whatsoever (not even
adding the SPDX identifiers).

For copyright details, please see:

https://github.com/dtolnay/proc-macro2/blob/1.0.101/README.md#license
https://github.com/dtolnay/proc-macro2/blob/1.0.101/LICENSE-APACHE
https://github.com/dtolnay/proc-macro2/blob/1.0.101/LICENSE-MIT

The next two patches modify these files as needed for use within the
kernel. This patch split allows reviewers to double-check the import
and to clearly see the differences introduced.

The following script may be used to verify the contents:

for path in $(cd rust/proc-macro2/ && find . -type f -name '*.rs'); do
curl --silent --show-error --location \
https://github.com/dtolnay/proc-macro2/raw/1.0.101/src/$path \
| diff --unified rust/proc-macro2/$path - && echo $path: OK
done

Reviewed-by: Gary Guo <gary@garyguo.net>
Tested-by: Gary Guo <gary@garyguo.net>
Tested-by: Jesung Yang <y.j3ms.n@gmail.com>
Link: https://patch.msgid.link/20251124151837.2184382-7-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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