os: drop `upstart` specific SIGSTOP signaling logic
Upstart is long dead, discontinued a decade ago, so there's no need to keep around a special signaling logic just for it.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net
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Upstart is long dead, discontinued a decade ago, so there's no need to keep around a special signaling logic just for it.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net