The libraries built in the `debian-android` job are not stripped because the job defines `ARTIFACTS_DEBUG_SYMBOLS: 1`. However this is not strictly necessary for testing purposes, so stop defining `ARTIFACTS_DEBUG_SYMBOLS` to reduce the size of the artifacts. Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/12879 Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34234>