Add support for removing abandoned files.

This change makes the bootstrapping process remove any files that were
previously created by invoking a Ninja rule (i.e. they appear in the .ninja_log
file) but are no longer a build output target.

Change-Id: I3c78e563393b97f8ca196ac85c7caa2b3866ffa6
5 files changed
tree: 8b9f67b628d6e5987952017eb88b6892f3abd17b
  1. blueprint/
  2. Blueprints
  3. bootstrap.bash
  4. build.ninja.in