Add rustbuild option to use Ninja for LLVM build

[caipre]

This change adds support for a ninja option in the [llvm] section of rustbuild's config.toml. When true, the option enables use of the Ninja build tool. Note that this change does not add support for Ninja to the old makefile based build system.

Closes #32809

r? @alexcrichton

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (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 Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed.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.

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[alexcrichton]

@bors: r+ 7dd0beb

Nice!

[alexcrichton]

@bors: rollup

[bors]

⌛ Testing commit 7dd0beb with merge e5803b1...

[bors]

💔 Test failed - auto-win-gnu-32-opt

[alexcrichton]

@bors: retry

On Thu, Apr 14, 2016 at 12:40 PM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-win-gnu-32-opt
http://buildbot.rust-lang.org/builders/auto-win-gnu-32-opt/builds/3797

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#32865 (comment)