Install additional LLVM DLL on Windows Fixes https://github.com/rust-lang/rust/issues/155268 The problem is that with shared linking to LLVM lib we have binaries requiring it in `$sysroot/bin` and `$sysroot/lib/rustlib/triple/bin`, but place the DLL only in the first location. On Unix systems rpath would take care of that, but on Windows the required DLL must be next to the binary or be found in PATH. This PR puts another copy of the library into that second location. The size overhead of such copy compared to static linking is much lower than I anticipated even though I couldn't manage to make bootstrap create hard links. The sizes without and with `llvm-tools` component: ``` ❯ du --summarize -h .rustup/toolchains/{additional-dll,static}* 638M .rustup/toolchains/additional-dll 800M .rustup/toolchains/additional-dll-tools 608M .rustup/toolchains/static-link 1.1G .rustup/toolchains/static-link-tools ``` Statically linked LLD sits at 139M while dynamically linked one is 7.5M + 150M for the libLLVM, so the difference is minor. Alternatively, we could require that on Windows, binaries located in `$sysroot/lib/rustlib/triple/bin` must always be called with `$sysroot/bin` in the PATH. However, that sounds like something that would require an announcement and some grace period.
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