Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# `unix_str`
+
+Unix-compatible strings regardless of platform, including `#![no_std]`
+environents. This crate is extracted from `std`.
+
+## Features
+
+- `shrink_to`: implements the unstable `shrink_to` method;
+- `unixstring_ascii`: ASCII transformations, `std`'s unstable feature;
+- `toowned_clone_into`: implements `ToOwned::clone_into`, an unstable method;
+- `alloc`: implements `UnixString` and transformations with `Box`, `Rc`
+  and `Arc`;
+- `std`: an alias for `alloc`.
+
+## License
+
+Licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE)
+  or http://www.apache.org/licenses/LICENSE-2.0)
+- MIT license ([LICENSE-MIT](LICENSE-MIT)
+  or http://opensource.org/licenses/MIT)
+
+at your option.
+
+## Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.