ninja-build: update to 1.9.0.

We've finally tagged a new release of Ninja, version v1.9.0!

The biggest feature of this release would be high-resolution
timestamps, so timestamps with a resolution under 1 second.
https://github.com/ninja-build/ninja/issues/371

There are also several small quality-of-life improvements, for
example ninja now enables Windows 10's ANSI color escape code
support.  https://github.com/ninja-build/ninja/issues/1451

For a complete list of changes see:
https://github.com/ninja-build/ninja/compare/v1.8.2...v1.9.0

(wiz)