php-in-php: drop always-on LibcExtern __phpc_resolve_stream (#32287)

[PurHur]

Summary

• Drop leftover always-on LibcExtern '__phpc_resolve_stream' so the always-on table is only the MCJIT alias set (syscall / __phpc_host_*). NestedJIT stream leaves declare the canonical i8*(i64) ABI via ensureResolveStreamDecl() (getNamedFunction first) so ensureExternal's addFunction-without-lookup cannot mint __phpc_resolve_stream.1 (Fix: AOT link fails for EVERY binary — duplicate memset declaration #31894 / Release v1.1.0: fix cold-build-check compile_failed on hello world (LLVM Module.php line 180; re-#24302) #32122 class).
• Body stays PHP/LLVM: StreamGlobalsJit (standalone) / JitStreamLibcHandleKernel (embed). phpc_stream.c remains deleted. User-script fopen()/fwrite() stay JitStreamIoKernel / StreamIo helpers.

Closes #32287

php-src: main/streams/streams.c — stream handle lookup (reference only).

Test plan

• ./script/phpunit.sh --filter 'LibcExternDeadDeclsRuntimeShrinkTest|ResolveStreamRuntimeShrinkTest|StreamGlobalsRuntimeStandaloneTest|MallocRuntimeShrinkTest' → OK (40 tests, 698 assertions)
• ./script/docker-exec.sh -- bash -lc './script/aot-smoke.sh' → 8 passed, 0 failed
• AOT fopen/fwrite still returns handle + write length (pre-existing AOT file_get_contents/file_exists mismatch not in this change)
• Did not run north-star5-verify --strict or full make test-harness

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