debian: Bump version to 0+git20191030.b848ba2-1

BUG=chromium:985174
TEST=None
Change-Id: Ib59090dd10dd7b517be6ef1e6301ddda7f988257
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/glbench/+/1889466
Reviewed-by: David Riley <davidriley@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Commit-Queue: Po-Hsien Wang <pwang@chromium.org>
Auto-Submit: Po-Hsien Wang <pwang@chromium.org>