fix: use response files on all platforms to avoid ARG_MAX

[kim-em]

This PR extends Lake's use of response files (@file) from Windows-only to all platforms, avoiding ARG_MAX limits when invoking clang/ar with many object files.

Lake already uses response files on Windows to avoid exceeding CLI length limits. On macOS and Linux, linking Mathlib's ~15,000 object files into a shared library can exceed macOS's ARG_MAX (262,144 bytes). Both clang and gcc support @file response files on all platforms, so this is safe to enable unconditionally.

Reported as a macOS issue at https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/The.20clang.20command.20line.20with.20all.20~15.2C000.20Mathlib.20.2Ec.2Eo.2Eexport/near/574369912: the Mathlib cache ships Linux .so shared libs but not macOS .dylib files, so precompileModules on macOS triggers a full re-link that exceeds ARG_MAX.

🤖 Prepared with Claude Code

[mathlib-lean-pr-testing]

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[leanprover-bot]

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• ❗ Reference manual CI will not be attempted unless your PR branches off the nightly-with-manual branch. Try git rebase 9a841125e75eab3c61e0b6affed684692312b668 --onto cda84702e9b31165f1f83c657b532f36f34e0bd0. You can force reference manual CI using the force-manual-ci label. (2026-03-03 04:27:13)

[kim-em]

@tydeu, can I merge this? It is solving a reported user problem.

[tydeu]

@kim-em I looked at this previously and shared Yury's question. With that resolved, this seems like a reasonable change. However, it should first go through release-ci with Lake tests temporarily enabled. That is, with this line temporarily uncommented.