Fix: "warning: redundant linker flag specified for library ole32"

[segevfiner]

llvm-config seems to output this library name correctly now, removing
the need for the hack in "librustc_llvm/build.rs".

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @nikomatsakis (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

[petrochenkov]

Ha, I was mildly annoyed by this message as well, thanks for fixing.
@bors r+ rollup

[bors]

📌 Commit 2e0043a has been approved by petrochenkov

[bors]

⌛ Testing commit 2e0043a with merge f4e4ada...

[bors]

💔 Test failed - status-appveyor

[Mark-Simulacrum]

@bors retry

We appear to have just failed to compile rustc:

:36:29]    Compiling rustc v0.0.0 (file:///C:/projects/rust/src/librustc)
[00:40:16] error: Could not compile `rustc`.
[00:40:16]
[00:40:16] To learn more, run the command again with --verbose.
[00:40:16]
[00:40:16]
[00:40:16] command did not execute successfully: "C:\\projects\\rust\\build\\x86_64-pc-windows-msvc\\stage0/bin\\cargo.exe" "build" "-j" "2" "--target" "x86_64-pc-windows-msvc" "--release" "--locked" "--features" "" "--manifest-path" "C:\\projects\\rust\\src/rustc/Cargo.toml"
[00:40:16] expected success, got: exit code: 101
[00:40:16]
[00:40:16]
[00:40:16] Build completed unsuccessfully in 0:17:04
[00:40:16] Command exited with code 1

[bors]

⌛ Testing commit 2e0043a with merge a0da1e0...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: petrochenkov
Pushing a0da1e0 to master...