[build-script]: Automatically choose a built ninja #80102
Merged
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Instead of using
--build-ninja
to decide to build ninja, build it automatically if a sufficiently new enough version is not available. Also record the build time taken to build the local Ninja so that we can see how much time we would save by stashing a pre-built Ninja in CI.This is more like how build-script pre-builds CMake when necessary.