Disable Tint's use of //build directory to fix Dawn roll

Change-Id: I340080dd62dd9b55ceac5e11c2d495fdada731dc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/763558
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed