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Use cmake TIMESTAMP function
because it is not only platform independent
but also allows to override the build date
This helps to make the java timestamp file in tigervnc builds reproducible.
See https://reproducible-builds.org/ for why this is good
Also adds UTC flag, to be independent of timezone.
Also changes JAVA_DATE format to ISO-8601 date format.
Requires cmake-2.8.11+ from 2013