You're not supposed to include a '\n' in mesa_log*() messages because
android logging will log what you provide on its own line anyway, so each
mesa_log() should be the body of a log line. But also, getting everyone
to consistently not do that is hopeless because we're all so trained by
printf(). So, just detect an existing \n and don't add a new one.
Cleans up deqp-vk debug output a bunch from turnip.
Acked-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15332>