Increase ninja thread count for Android build on Linux.

Change-Id: Ib637360e2f09cd2851771595590203da6195a314
Reviewed-on: https://skia-review.googlesource.com/107600
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
7 files changed