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fix: remove the check of lld not supporting @response-file
In LLVM v9, lld has supported `@response-file.`
LLVM v9 was released on 2019-09-19.
The check was added back to 2018-03-14 (1.26.0) via 04442af18bf0.
It has been more than five years, and we ship our own lld regardlessly.
This should be happily removed.
See also:
* <bb12396f91>
* <https://reviews.llvm.org/D63024>
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.