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Adding one more [1] exit early safeguard in *nix build scripts: Given the initial cd into the build tree fails (the project root), the `buildconf` script exits with non-zero status (failure). Additionally quoting the pathname to cd into and the empty CD_PATH parameter for portability, also for systems that are using a non-portable pathname [2] for the build tree. [1]: https://github.com/php/php-src/pull/16717 [2]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_271 Closes GH-16724.