php-in-php: delete JitEnv emitLibcPutenvMirror — PutenvJitHelper + kernel (#23414)

[PurHur]

Summary

• Delete emitLibcPutenvMirror / inline malloc+setenv LLVM from JitEnv.php (~108 LOC removed; 262→154 lines).
• Route putenv through slim PutenvJitHelper NestedJIT leaf + phpc_putenv_kernel / JitPutenvKernel (peer getenv/rename), avoiding co-emission of GetenvJitHelper::apacheSetenv that segfaulted user-script AOT putenv on master.
• Flip PutenvRuntimeShrinkTest to guard absence of caller-side LibcExtern; inventory/spine include new files (6574/6574).

Closes #23414

php-src reference

• ext/standard/basic_functions.c — zif_putenv

PHP implementation

• ext/standard/PutenvJitHelper.php — overlay + kernel call
• ext/standard/JitPutenvKernel.php / phpc_putenv_kernel.php — thin setenv mirror
• ext/standard/JitEnv.php — helper-only putenv paths

C runtime

• No new runtime/*.c. Net shrink: caller-side LLVM deleted from JitEnv.php (−108 lines).

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
export PHP_COMPILER_HELPER_RUNTIME_O=0
vendor/bin/phpunit test/unit/PutenvRuntimeShrinkTest.php
# OK (5 tests, 29 assertions)
tmpdir=$(mktemp -d)
cat > "$tmpdir/t.php" << "PHP"
<?php
putenv("PHPC_PE=1");
echo getenv("PHPC_PE");
PHP
PHP_COMPILER_AOT_USER_SCRIPT=1 php bin/compile.php -o "$tmpdir/pe" "$tmpdir/t.php"
"$tmpdir/pe"   # prints: 1
php script/bootstrap-inventory.php --check   # OK 6574/6574
BOOTSTRAP_ALLOW_STALE_COMPILED_DRIVER=1 make bootstrap-selfhost-vm-driver-execute-probe
# OK /compiler/build/selfhost-lib-spine-smoke
'

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