consolidate MITSHM and HAS_SHM symbols
Both symbols are set on exactly the same condition (build_mitshm), so can be consolidated into one: MITSHM
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net
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Both symbols are set on exactly the same condition (build_mitshm), so can be consolidated into one: MITSHM
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net