VmFsUnlink/VmFsGlob: bootstrap without ext/ffi (#7314)

[PurHur]

Summary

• VmFsUnlink: when ext/ffi is unavailable or PHP_COMPILER_DISABLE_FFI=1, fall back to host @unlink() instead of returning false silently — fixes bootstrap temp-file cleanup (php-in-php: VmFsGlob/VmFsUnlink — delete host ext/ffi glob(3)/unlink(2) shims (bootstrap self-host) #7314, Bootstrap: VmFs::unlink() — libc unlink(2) without host @unlink (ext/standard/filestat.c) #5063).
• VmFsGlob: add host \glob() path between libc FFI and pure-PHP iterator fallback; respect PHP_COMPILER_DISABLE_FFI.
• Tests: unlink_bootstrap.phpt, VmFsUnlinkBootstrapTest (FFI disabled via env).

C runtime: no new C; VM no longer requires FFI::cdef for unlink/glob on the Zend driver. JIT/AOT unchanged (JitUnlink / __phpc_glob_vec).

php-src reference

• ext/standard/filestat.c — php_unlink
• ext/standard/dir.c — PHP_FUNCTION(glob)

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/unit/VmFsUnlinkBootstrapTest.php test/unit/VmFsUnlinkTest.php test/unit/VmFsGlobTest.php'
# OK (1 test, 5 assertions) + existing unlink/glob unit tests

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter unlink_bootstrap'
# OK (2 tests, 2 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
PHP_COMPILER_DISABLE_FFI=1 php bin/vm.php -r "
\$f = tempnam(sys_get_temp_dir(), \"t\");
var_export(file_exists(\$f));
var_export(unlink(\$f));
var_export(file_exists(\$f));
"'
# truetruefalse

Closes #7314

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