Upstream ninja commit `ad3d29fb53` (Put builder output through status
interface) from ninja PR 1899 changed the status output from stdout to
stderr. In particular, `ninja: no work to do` is now printed on stderr.
Update our RunCMake tests to accept this difference.
A few RunCMake test cases check for `ninja: no work to do`. For those,
move the message to stdout using `RunCMake_TEST_OUTPUT_MERGE`. The rest
of the test cases do not care about the message, so remove it from the
actual stderr content before comparing against that expected.
d33c2c93d8