[clang] [Clang] Remove NetBSD/i386 workaround for FP eval method with older versions (PR #74025)

[Michał Górny via cfe-commits]

https://github.com/mgorny approved this pull request.

Code LGTM but please add a note to the release notes, as was requested.

https://github.com/llvm/llvm-project/pull/74025