[NinjaBuildCommand] Flush the running status for console jobs.
[NinjaBuildCommand] Flush the running status for console jobs.

 - We want to ensure the status line is emitted and complete before the console
   job writes to the (unbuffered) output.

apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild