debian: Bump version to 19.2.0~cros1-4 for buster.

Unable to have the same version for stretch and buster, so do a version
bump for buster.

BUG=chromium:979461
TEST=buildpackages.sh

Change-Id: I7476793812502874fbb5da12b3a5cd1536d4161e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/mesa/+/1828336
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Commit-Queue: Stephen Barber <smbarber@chromium.org>
1 file changed