cargo: exclude Unicode data files

This will mean that you can't easily run tests on the artifact uploaded
to crates.io, but I'm not sure that's a use case we really care about.

If this change breaks you, please file a new issue about it and your use
case: https://github.com/BurntSushi/bstr/issues

Fixes #200

Cargo.toml

@@ -10,7 +10,7 @@ readme = "README.md"
 keywords = ["string", "str", "byte", "bytes", "text"]
 license = "MIT OR Apache-2.0"
 categories = ["text-processing", "encoding"]
-exclude = ["/.github", "/scripts"]
+exclude = ["/.github", "/scripts", "/src/unicode/data"]
 edition = "2021"
 rust-version = "1.73"
 resolver = "2"