Log Message:
sysutils/xcp: update to 0.20.2

v0.20.2
 - Move to simpler libxcp driver API.
 - Add some more pre-run checks for argument corner cases.

v0.20.1
 - Update shell completions with --no-timestamps option.

v0.20.0
 - This release adds copying of file timestamps. This is enabled by default,
   and can be disabled with the new --no-timestamps option.