bump minimal xorg version to 1.18
1.18 was released a decade ago, so it seems reasonable stop supporting older ones.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net
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1.18 was released a decade ago, so it seems reasonable stop supporting older ones.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net