[6.1][build-script] Stop installing the llbuildSwift library that is no longer used #78038
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Explanation: This installed library in the toolchain has been unused on linux and macOS for years.
Scope: Remove a single unused library from the linux and macOS toolchains
Issue: None
Original PRs: #77647
Risk: Very low
Testing: Passed all CI on trunk
Reviewer: @bnbarham
@DougGregor, another unused library cleanup.