martine/ninja — pull request #238 by pcc (2012-03-05 02:00:11+00:00)
Title: Mark a phony target with no inputs as outputs-ready

Even if such a target is dirty (i.e. the file does not exist), it
has nothing to do, which makes it safe to mark as outputs-ready.
Without this change, ninja will print no output when rebuilding the
target (or an order-only dependency thereof), instead of reporting
it has "no work to do".