Tests: Update for upstream ninja change to write status on stderr

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.

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