ui/sdl: add QEMU_ENABLE_SDL_LOGGING setting/environment

Enable SDL logging when QEMU_ENABLE_SDL_LOGGING variable is set, as
suggested by Sam Lantinga, upstream SDL maintainer.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
1 file changed