debian: Undo unneeded comma-stripping from meson config flags.

BUG=chromium:972237
TEST=Builds

Change-Id: I6753eab08ea974ce4a45c246b75432c44bb2f9ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/mesa/+/1686536
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
2 files changed