Changed bootstamp function in Windows to use EventLog service Changed bootstamp function in Windows to use EventLog service start time as system bootup time. Previously used `LastBootupTime` from WMI was unstable with time synchronization and hibernation and unusable in practice. If you really need to obtain pre Boost 1.54 behaviour define `BOOST_INTERPROCESS_BOOTSTAMP_IS_LASTBOOTUPTIME` from command line or `detail/workaround.hpp`. Fixes #7936

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