AOT: RecursiveIteratorIterator LEAVES_ONLY flatten honors SKIP_DOTS (#34624)

[PurHur]

Summary

• When RecursiveIteratorIterator flattens an inner RecursiveDirectoryIterator hashtable for LEAVES_ONLY thin AOT, skip ./.. filename leaves when the inner iterator carries FilesystemIterator::SKIP_DOTS in __flags (php-src spl_directory.c readCurrent semantics).
• Mirrors directory iterator foreach: scandir snapshot still holds dot entries; iteration and RII flatten now both filter them.

php-src

• ext/spl/spl_directory.c — SPL_FILE_DIR_SKIP_DOTS / spl_filesystem_dir_read

Verify

./script/aot-smoke.sh
# aot-smoke: 8 passed, 0 failed

./script/phpunit.sh --filter RecursiveDirectoryIterator34624AotTest
# OK (4 tests, 10 assertions)

./script/docker-exec.sh -- bash -lc 'php bin/compile.php -o /tmp/rdi.bin test/repro/recursivedirectoryiterator_aot_34624.php && /tmp/rdi.bin'
# rdi:a.txt
# rii:a.txt
# rii_ok:1

Closes #34624

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