ARROW-11329: [Rust] Don't rerun build.rs on every file change
ARROW-11329: [Rust] Don't rerun build.rs on every file change

This speeds up development by avoiding rebuilding the whole library
when any file in the package directory is touched.

Closes #9277 from mbrubeck/build

Authored-by: Matt Brubeck <5fbe89295ed5fbc903a91b921e10112e97e4a3cb@limpet.net>
Signed-off-by: Jorge C. Leitao <dfffc62510208f06492f17a48dc6ce87aa15abf6@gmail.com>

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