Pass --ninja to makeparallel for ninja

When parallelism is being handled by ninja, pass --ninja to makeparallel
to have it translate -j with no number to default ninja parallelism, and
-k to -k0.

Bug: 24199503
Change-Id: Ic1be7572f93b33e4a71ed23e9e73dea1d4255703
1 file changed