Revert "Scripts: +phpenv and +php-build."

This reverts commit a6c9b2f3aa024ac82b46275a10c26fb6d4054e8d.
Revert "Git: Add 'phpenv' as a Git submodule, not used yet."

This reverts commit 8f9d451415d78572982bc8d8890f8090c2956045.
Scripts: +phpenv/phpenv.